The invention discloses an environment-friendly metal surface paint spraying device. The device comprises a shell. The lower portion of the left side surface of the shell is fixedly connected with a box. The lower surface of the inner wall of the box is fixedly connected with a paint spraying pump. The upper surface of the paint spraying pump communicates with one end of an organ hose. The other end of the organ hose penetrates through a first hose sleeve and a second hose sleeve to communicate with the left side surface of a spray nozzle. According to the environment-friendly metal surface paint spraying device, by arranging the paint spraying pump, the paint spraying pump pumps paint in the box and conveys the paint into the spray nozzle through the organ hose; by arranging a motor, an output shaft of the motor rotates forwards to drive a roller to rotate, and a pulling rope is wound; and when the spray nozzle moves to the rightmost end, the output shaft of the motor is controlled torotate backwards to drive the roller to rotate, the pulling rope is loosened, a telescopic rod and a spring are shortened and drive a connecting plate and the spray nozzle to move leftwards, and thesituation that paint is scattered in the air in a closed space and harms people and pollutes the environment is avoided.