The invention belongs to the technical field of a machine-borne communication network, and discloses a test method for machine-borne network data sequence completeness by aiming at the sequence completeness requirement of the machine-borne network system data frame transmission. According to the method, three different scenes that tested equipment receives a frame sequence with the correct SN (serial number), the tested equipment receives a frame sequence with the lacked SN, and the loss of two SNs in the frame sequence is detected are respectively tested, and in addition, whether the tested equipment can correctly process the received data frame under the enabling and non-enabling conditions of the completeness inspection or not also needs to be tested and verified. When the method provided by the invention is used, the received data frame can be correctly processed, and the sequence completeness test of the tested equipment is qualified. The test method has the advantages that the influence caused by frame loss, frame mistake and switch blockage on the system in the network transmission process is reduced, so that the data transmission reliability of a machine-borne network system is enhanced.