The invention provides a joint debugging test system and test method for a command and control system. The joint debugging test system for the command and control system comprises a reinforced portable computer, a joint debugging test diagnosis unit, a communication network control device and a communication device. The communication network control device is connected with the reinforced portable computer and the communication device. Communication connection is established between the reinforced portable computer and an overhauled device through the communication network control device and the communication device. According to the joint debugging test diagnosis unit, communication data generated when simulated communication is carried out with the overhauled device is obtained through a data simulation module. The communication data is analyzed through a data processing module. Frame error rate detection data generated when simulated communication is carried out is obtained through a data analysis module. Fault diagnosis is carried out through a fault diagnosis module and a maintenance instruction module, thereby locating a fault source and determining a fault elimination strategy. Through application of the system and the method, a joint debugging test, fault diagnosis and location can be carried out on the overhauled device command and control system, and the fault elimination strategy can be provided.