The invention discloses a waste paint treatment system of a full-automatic spray painting robot for motors. The waste paint treatment system comprises a device body, a wastewater temporary storage tank, a treatment tank, a drive wheel, driven wheels and rotary shafts, wherein the wastewater temporary storage tank is mounted on the left of the device body, a submersible pump is mounted in the wastewater temporary storage tank, the wastewater temporary storage tank is connected with the treatment tank through a water pipe, a chemical agent inlet is arranged in one side of the treatment tank, the treatment tank is connected with the wastewater temporary storage tank through a return pipe, a water pump is mounted in the middle of the return pipe, a motor is mounted on one side of the treatment tank, the drive wheel is mounted at the front end of the motor, the drive wheel is connected with one driven wheel through a belt, one driven wheel is welded to the upper side of each rotary shaft, and stirring blades are mounted on the upper sides of the rotary shafts. The waste paint treatment system has the advantages that the output end of a water quality detector is electrically connected with an automatic switch, the water quality of wastewater inside the wastewater temporary storage tank is detected through the water quality detector, and the automatic switch is turned on when the water quality meets the requirements.