In order to solve the problem that 2BF–02 type of corn fertilizer machine with pricking hole under whole plastic–film on double ridges can’t discharge fertilizer block smoothly, a fertilizer block crushing device was designed, which consisted of shell and wheels. The discrete element model of fertilizer block was generated by EDEM software to carry out the numerical simulation according to the 3–factor and 3–level orthogonal experiment. The results showed that factors affected crushing rate in descending order were wheel distance, wheel speed and wheel tooth, respectively. When the wheel distance was 6 mm with 60 the wheel tooth under the wheel speed of 150 r/min was, the crushing rate of fertilizer block was 98.8% (maximum value). In order to verify the validity of simulation results, the experimental test was conducted and obtained the crushing rate of fertilizer block was 94.4%.