Finger joint of lightweight mechanical arm

The utility model relates to a finger joint of a lightweight mechanical arm, and belongs to the field of mobile inspection robots. Comprising a finger lower shell, a finger driving source, a finger middle frame, a finger control panel, a light guide plate, a finger upper shell, a finger top plate, a top plate trigger switch, a finger upper shell fixing screw, a finger bottom plate, a finger signal line and a finger lower shell fixing screw. The finger driving source is arranged between the finger middle frame and the finger lower shell, the finger control panel is arranged in a square groove in the front end of the finger middle frame, the light guide plate is arranged in a clamping groove in the finger upper shell, and the top plate trigger switch is arranged in a square cabin defined by the finger top plate and the finger middle frame. The finger signal line provides power and communication signals for the finger driving source and the finger control board. The utility model has the advantages of attractive