Aiming at the optimization of equipment maintenance support under the new situation, an architecture of equipment maintenance simulation system is proposed. The relationship between the key elements in the process of maintenance support is analyzed, and the user requirements of equipment maintenance simulation system are described; taking the optimization of maintenance time as an example, the task allocation optimization model of static maintenance is established, and the maintenance support process model under the condition of dynamic maintenance is designed. analytic hierarchy process (AHP) and technique for order preference by similarity to an ideal solution (TOPSIS) were used to compare the maintenance effectiveness of different maintenance units. The data analysis and simulation function of the simulation system is realized based on the discrete event simulation library Simpy, and the simulation verification is carried out with the maintenance support data of a certain type of equipment. The simulation results show that the system can provide reference for the process design, resource allocation and optimization of equipment maintenance.