Numerical crushing experiment of brittle rock(granite) by different load patterns under single-cutter head and dual-cutter head has been done with the rock failure process analysis software-RFPA2D. Acoustic emission activities are used to measure the rock crushing effect. Results show that (1)If the static load is too small or the stress wave amplitude is smaller than rock strength, the rock crushing effect is very poor. (2)No matter it is single-cutter head or dual-cutter head, coupled static and dynamic loads can raise the rock crushing effect substantially. In addition, the acoustic emission energy under single cutter head is more than dual-cutter head. (3)The head space has an effect on the rock crushing effect of rock crushing by combined dynamic and static loads under dual-cutter head.