Multi-axis joint mechanical arm

The utility model discloses a multi-shaft joint mechanical arm, which relates to the technical field of mechanical arms, and comprises a first mechanical arm, a second mechanical arm, a third mechanical arm and a fourth mechanical arm, the first connecting body is mounted at the right end of the first mechanical arm; the second mechanical arm is mounted at the upper end of the first connecting body; the second connecting body is mounted at the top end of the second mechanical arm; the third mechanical arm is mounted on the right side of the second connecting body; and the third connecting body is mounted at the right end of the third mechanical arm. Through the arrangement of the first connecting body, in the operation process of the mechanical arm, the second connecting column and the third connecting column rotate around the second rotating shaft to achieve the change of the detection distance and the detection position, when the mechanical arm moves, abrasion is likely to be generated due to friction of sh