The utility model discloses a modular compound fertilizer rubbing crusher, including motor, casing, screen cloth and first running roller, the top at the casing is installed to the feeder hopper, roller frame installs the inner wall upper portion position at the casing, the motor is installed in the right side of casing outer wall upper portion position, stock guide one end is installed on the inner wall of casing, and the other end is installed on the blade disc support, the cutter equipartition is installed on the blade disc, the blade disc is installed on the blade disc support, the blade disc support mounting is in shells inner wall's lower part position, the downside at the blade disc support is installed to the screen cloth, go out the downside of hopper installation blade disc support, the front side at the casing is installed to the commutator, driving gear and driven gear install at first running roller axle and second running roller epaxially respectively, and this modular compound fertilizer rubbing crusher can smash the material through the cutter of installing on the blade disc, and be crushing efficient, can change the screen cloth of different meshs size moreover, and application scope is wide.