Aiming at improving the existing problem of inefficient and inflexible data transmission, The article proposed based on LPWAN and LAN mixed communication mode of data transmission. Design the data transmission channel between device and computer with selecting a module of LPWAN protocol and the module of LAN protocol. Practical application results show that the device of tubing non-destructive testing system enables the system to be conveniently arranged on the site where the wires will be damaged and eliminates the problem of limited data transmission. The transmission speed is improved and provides conditions for equipment upgrading.