The invention discloses a TTE network transmission delay test system. The system comprises a to-be-tested TTE network, test execution equipment and test management equipment; the test management equipment is used for responding to a user test operation and sending a time delay test instruction to the test execution equipment; and the test execution equipment is used for acquiring sending signal information and receiving signal information in the TTE network to be tested in response to the time delay test instruction, and determining the transmission time delay of the TTE network according to the sending signal information and the receiving signal information. Visibly, the transmission delay of the TTE network is analyzed in a mode of combining board card trigger acquisition and software data analysis in the test execution equipment, that is, time data acquisition and analysis are performed on the TTE network at a board card level, the risk of influencing the data in the TTE network at a protocol layer is reduced, and the use of third-party test equipment is avoided, therefore, the complexity of TTE network testing is reduced, and the risk that TTE network transmission information is tampered and the correctness of transmission data is affected is also reduced.