The invention discloses a high-strength GAP (glycidyl azide polymer) commixture and aims to solve the problems that a conventional GAP is poor in mechanical property and a conventional commixture is physically incompatible with a common plasticizer of an explosive. The commixture is prepared by commixing a GAP with hydroxyl terminated polyether, N-100 is adopted as a curing agent, and triphenyl bismuth is adopted as a catalyst. The tension strength of the commixture is increased by 30% when being compared with that of a pure GAP, and the ductility is increased by 61%.