Pressure-suction type air gun

The utility model relates to a pressure-suction type air gun which is a pressure-suction type paint spraying device. The pressure-suction type air gun comprises a paint can, a gun body, a chucking device, a gun head, a trigger, a nozzle and a paint delivery guide pipe. The pressure-suction type air gun is characterized by being improved on the basis of an existing air gun, a compressed air delivery guide pipe with a pressure reducing valve is added, and the pressure reducing valve is arranged on the gun body and communicated with an internal air pipe of the gun body; the upper end of the compressed air delivery guide pipe is connected with the pressure reducing valve while the lower end of the same is communicated with the paint can. By the aid of the added compressed air delivery guide pipe with the pressure reducing valve, positive pressure is applied to the paint can through an original hole communicated with the atmosphere, so that original spray effect can be kept, paint flow is enabled to be larger than that of the existing air gun by adjusting the added pressure reducing valve according to actual requirements, section range of paint mist is large, spraying time is saved by two times, and working efficiency is improved greatly.