The invention discloses an eight-freedom-degree mechanical arm system of an AGV chassis. The mechanical arm system comprises a six-shaft mechanical arm system and a wheel-type AGV carrier vehicle, wherein the six-shaft mechanical arm system comprises a standard six-shaft mechanical arm and a tail end execution mechanism; the wheel-type AGV carrier vehicle comprises a vehicle body, a vehicle head and wheels, the upper end of the vehicle body is provided with the standard six-shaft mechanical arm, the side face of one side of the vehicle body is provided with an infrared distance measurement sensor, the left of the top face of the vehicle head is provided with a storage battery, the top face of the storage battery is provided with a moving warning indicator, the top face of the right of the top face of the vehicle head is provided with a control panel, the lower portion of the control panel is provided with a wireless transmission module, a camera pan-tilt is arranged between the control panel and the moving warning indicator on the top face of the vehicle head, the front end face of the vehicle head is provided with a wall barrier sensor, the left side face of the vehicle head is provided with a charger, and the right side face of the vehicle head is provided with a controller. The eight-freedom-degree mechanical arm system of the AGV chassis has the advantages that dependence of a traditional moving mechanical arm on a rail can be eliminated, maintenance work of the moving mechanical arm is reduced, the occupied area is saved, path setting is simple and flexible and cost is low.