The invention provides a multi-fracture rock sample mould capable of precisely positioning the rock bridge intersection angle and the rock bridge length. The multi-fracture rock sample mould comprises prefabricated fracture sheets, fixing plates, fixing bolts, a bottom plate, first side plates, second side plates and scale plates. The bottom plate, the first side plates, the second side plates, the scale plates and the fixing plates are made of organic transparent plates. Through adjustment of the horizontal positions of the scale plates of the mould in cooperation with changing of the inclination angles, sizes and positions of fixing seams formed in the fixing plates, adjustment of the positions, inclination angles and the like of the prefabricated fracture sheets in the mould can be achieved; besides, due to the fact that the horizontal positions of the scale plates and the fixing seams in the fixing plates can be independently adjusted, free adjustment of the rock bridge intersection angle and the rock bridge length can be achieved through cooperation of the structure and the prefabricated fracture sheets. The mould has the advantages that the adjustment method of the rock bridge intersection angle and the rock bridge length is simple, and diverse adjustment modes are available.