For the verification of software, digital simulation is an indispensable method. At present, in the field of LEO communication satellite, there is a lack of relevant technical research on the simulation of terminals in CAN bus network environment. Therefore, it is very important and difficult to build a systematical simulation of the terminal in CAN bus network, which can support the verification of LEO communication satellite software. In this paper, the related technology of terminal simulation in CAN bus network is researched. The simulation configuration structure model of terminal is proposed, and the corresponding simulation system is built, which can support the real-time injection simulation and provide closed-loop feedback mechanism, and thus can effectively support the ground verification of LEO communication satellite software with CAN bus architecture.