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During the transmission of vehicle-mounted railway track inspection data in operation, with the increase of the amount of transmission data, the unreasonable layout of local area network is reflected, resulting in the decline of data transmission capacity and security. A wireless transmission and encryption system for vehicle-mounted railway track inspection data is designed. The data wireless transmission encryption system framework is built by on-board equipment, DMS, wireless communication module, data receiving antenna and data receiving device, and a local area network is built by using multiple wireless APs, which is linked to the on-board wireless transmission network in real time and carries out data transmission for railway track inspection. With the support of the system framework, the system hardware and software are designed respectively. The system hardware is mainly divided into three levels: business logic, data analysis and wireless communication. The system software mainly uses AES to encrypt the patrol data, obtain the corresponding digital signature, and transmit the encrypted data through wireless network. The system application test shows that the designed system has good data transmission capability of vehicle-mounted railway track patrol inspection, good data encryption performance and fast transmission speed.