The invention provides a planar multi-joint robot which comprises a rotary table mechanism, a lifting mechanism, a rotating mechanism and a push-pull mechanism, wherein the lifting mechanism is arranged on the rotary table mechanism; the lifting direction of the lifting mechanism is perpendicular to a rotating plane of the rotary table mechanism; the rotating mechanism is connected with the lifting mechanism in a pivoting manner; the rotating plane of the rotating mechanism is perpendicular to the lifting direction of the lifting mechanism; the push-pull mechanism is connected with the rotating mechanism and is provided with a space for containing an automobile battery. The push-pull mechanism for loading and unloading the automobile battery can realize multi-rotation through rotation of the rotary table mechanism and rotation of the rotating mechanism; by lifting of the lifting mechanism on the rotary table mechanism, the push-pull mechanism can move up and down, and multi-dimensional movement of the push-pull mechanism in the space is realized. According to the planar multi-joint robot, the flexibility of battery exchange is improved; a requirement on automobile battery exchange can be met, so that the battery can be accurately replaced on an automobile at different positions.