The invention discloses an automatic painting device for automobile glass primer. The device comprises a bracket (14), a material bag (4), a material bag squeezing device, a material conveying pipe (9) and a painting head (7); the material bag (4) is arranged on one side plate of the bracket (14), the lower part of the material bag is connected with the material conveying pipe (9); the material conveying pipe (9) supplies the primer to the painting head (7) for a worker or a robot to paint the glass primer. The device provided by the invention has a simple structure, is convenient, safe and reliable in operation. The device can realize automatical primer painting, thus, the primer sucked by the worker can be reduced effectively, and the labor protection effect is remarkable.