Circuit board with long service life for precision electronic engineering

The utility model discloses a circuit board with long service life for precision electronic engineering, which comprises a circuit board body, one side of the circuit board body is bonded and connected with a high-temperature-resistant coating, and an inner cavity of the high-temperature-resistant coating comprises a polytetrafluoroethylene coating, a phosphate lead powder coating and a tungsten carbide coating. According to the utility model, through the arrangement of the high-temperature-resistant coating, the polytetrafluoroethylene coating, the phosphate lead powder coating and the tungsten carbide coating, the high-temperature-resistant effect can be achieved, the phenomenon that parts are damaged due to the influence of high temperature is avoided, the service life of the circuit board is greatly shortened, and the service life of the circuit board is prolonged. Through the arrangement of the corrosion-resistant coating, the perchloro-ethylene coating, the epoxy zinc-rich coating and the polyimide coat