Son of Pietro, a socialist lawyer, and Marina Arreghini, after two years of local primary school Giuriolo continued his studies in Bologna. In 1924, the family moved to Vicenza, where he attended the Liceo Pigafetta. In 1930, he enrolled at the University of Padua, graduating in law (1933) and Arts (1935). He associated with Aldo Capitini, philosopher and religious thinker with whom he shared his ideals of non-violence, truthfulness and non-cooperation with the Fascist regime, and Norberto Bobbio, philosopher, jurist, political scientist, historian, and senator with whom he first began attending liberal-socialist movement meetings. Giuriolo distinguished himself as a translator and literary critic, refusing membership of the National Fascist Party, and made a living from casual teaching.

During military service, Giuriolo attended the Infantry Officers’ course in Salerno. Discharged as Lieutenant in 1934, he was recalled until 1936 and again in 1939, when he was transferred to the 3rd Alpine Regiment and was discharged in 1940. Between 1941 and 1942, he organised groups of students in Vicenza, introducing them to anti-fascism and free debate. On 1 January 1943, he was recalled as Captain to the 7th Alpine Regiment in Belluno. Meanwhile, he was one of the founders of the Partito d'Azione (Action Party) in Veneto, aimed at combatting Fascism.

Following the armistice of 8 September 1943 marking Italy's surrender to Allied forces, Giuriolo joined the Resistance with the Giustizia e Libertà Brigades, operating in Friuli and then Belluno area. In May 1944, he moved to the Altopiano dei Sette Comuni, where he organised a group of students, the “piccoli maestri”, as recalled by writer Luigi Meneghello. His nom de guerre was “Capitano Toni”.

Wounded in the hand during a round-up and treated in Bologna, he then accepted Gianguido Borghese’s proposal (Regional Commander of Matteotti Brigade) to reorganise the Matteotti “Montagna” Brigade in the upper Reno valley. Under his command, the unit operated between Bologna, Modena and Pistoia, contributing to the liberation of various towns, including Porretta Terme, which was handed over to the American soldiers of the 5th Army. The brigade, having been re-armed, switched to positional warfare, engaging in fierce fighting.

On 12 December 1944, at Corona di Lizzano in Belvedere, Giuriolo was killed by a burst of fire during a fight whilst attempting to recover the bodies of comrades. Fellow partisans Pietro Galiani and Nino Venturi were killed alongside him. The bodies were recovered in March 1945. Giuriolo was posthumously awarded the Gold Medal for Military Valour.