The invention relates to a volume fracturing method for a crack net of a carbonate reservoir. The volume fracturing method comprises the following steps that (1) initial crack initiation is conducted,specifically, slickwater is injected into a pretreated formation for crack making, then gel acid is injected for conducting acid etching transformation on cracks, and the crack length is increased; (2) temporary blocking in the cracks is conducted, specifically, microcracks formed by acid etching formation are temporarily blocked through temporary blocking agents carried by the slickwater; (3) turning for acid fracturing is conducted, specifically, gel acid is injected into the temporarily-blocked formation, and after the temporary blocking agents are displaced in place by the gel acid, the gel acid turns to other parts for acid etching transformation; (4) crack making through slickwater is conducted, specifically, slickwater is injected into the formation subjected to acid etching transformation in the step (3) for crack making; and (5) crack-expansion supporting is conducted, specifically, sand-carrying fluid is injected into the formation subjected to crack making in the step (4) for supporting. According to the volume fracturing method for the crack net of the carbonate reservoir, liquid leak-off can be effectively reduced, the effect of 'near-control and far-expansion' is achieved, the abundant secondary cracks can be formed, connectivity with main cracks and natural cracks is improved, and thus the transformation effect of volume fracturing is improved.