Aiming at the problem that the fault diagnosis of armored vehicle diesel engine injector can not meet the real-time on-line monitoring, a fault diagnosis method of armored vehicle diesel injector based on multi-layers bidirectional long short term memory (Bi-LSTM) network is proposed. The simulation experiment of diesel injector fault is carried out. Taking advantage of the long-distance time sequence analysis ability of multi-layer bidirectional long-short term memory network, the fault pattern recognition verification is carried out by taking the pressure wave feature value and pressure wave time sequence signal as input respectively. The results show that the method has higher recognition accuracy and faster classification speed, and can meet the requirements of real-time online monitoring.