Automated spraying production line of car bumper

The utility model relates to an automated spraying production line of a car bumper. The automated spraying production line comprises a chain transmission mechanism, M spraying tool frames, a cylinder auxiliary clamping and positioning mechanism, 2N spraying robots, an in-place signal sensor used for receiving in-place signals of the spraying tool frames, and a PLC control system used for controlling motions of the chain transmission mechanism, the spraying tool frames and the spraying robots, wherein the spraying tool frames are installed on the chain transmission mechanism, the cylinder auxiliary clamping and positioning mechanism is composed of two clamping cylinders which are installed on the two sides of the chain transmission mechanism respectively, every two spraying robots serve as one group and include a first process spraying robot and a second process spraying robot, and M is larger than or equal to N which is larger than or equal to 2. The automated spraying production line can make up for the defe