The invention provides an embedded software testing auxiliary system, and aims at providing a software testing auxiliary system which can improve the efficiency of building a testing environment, lower the operation difficulty and improve the usability. According to the technical scheme, an upper computer constructs a testing crosslinking environment of tested equipment and testing equipment, describes bus attributes, an interface control document ICD, testing case preconditions and testing steps, forms control law data according to the preconditions and the testing steps to dispatch testing data, sends, judges and receives the data, and conducts reverse analysis on the received data according to an ICD format; a lower computer cooperates with the upper computer to send the data through adetailed bus, then the data is received, testing cases and design constructed by data simulation and receiving-sending procedure control are automatically executed, and simulation of embedded softwareperipheral equipment and monitoring and detecting of the interaction process of peripheral equipment data are achieved. According to the embedded software testing auxiliary system, the testing casesof controlling a construction testing scene are executed based on the data receiving-sending procedure, and the time for developing a simulation system is shortened.