The tooth height of the double-toothed roll crusher is the main tooth structure parameter that affects its crushing performance. The material crushing state of the roll tooth structure with different tooth heights is simulated and analyzed by discrete element method. The analysis results show that with the decrease of tooth height, the position of material crushing gradually shifts to the lower roller tooth inclusion cavity, which avoids the crushing of large materials in the direction of larger size, thus reducing the tooth roller torque, but the reduction range of the tooth roller torque becomes smaller and smaller. The ratio range of tooth height/roll tooth center distance should be controlled between 0.6 and 0.7. In this range, not only the discharge particle size of the double-toothed roll crusher meets the design requirements, but also the sum of the torque of the double-toothed roll is small, which is beneficial to reduce the energy consumption of the crusher.