Mechanical arm

The utility model belongs to the technical field of mechanical arms, and particularly relates to a mechanical arm which comprises a clutch module, a base fixedly connected with the clutch module is arranged at the upper end of the clutch module, and three knuckle assemblies are installed at the upper end of the base. The knuckle assembly comprises a motor fixing block, a second motor, a second coupler, a third sliding block, a second lead screw, a third connecting rod, a first baffle, a second baffle, a limiting plate, a first connecting shaft, a second connecting shaft, a third connecting shaft, a limiting block, a fourth connecting rod, a fifth connecting rod, a fourth connecting shaft, a fifth connecting shaft and a supporting rod, and mechanical fingers are installed at the upper end of the supporting rod. A traditional manipulator is small in degree of freedom, can only clamp or operate equipment and structures with fixed sizes and fixed shapes, and is poor in flexibility, and the manipulator achieves cl