The utility invention discloses a quick-release type three-in-one pneumatic nailer, comprising a body, a handle, a magazine, a loading nails hole arranged on the right side of the magazine and a nailer head in front of the body, is characterized in that: a magazine guide bar fixing in the rear of the magazine, a magazine fixing plate is arranged in the higher part of the front side of the magazine; a snap pin is arranged in the nailer head matched with the magazine fixing plate; an angle adjusting block is fixed in the lower part of the handle; the angle adjusting block in provided with a plurality of slots matched with the magazine guide bar. The quick-release type three-in-one pneumatic nailer of the utility invention, which of the magazine is set to be releasable device by matching chimeric the magazine fixing plate and the pin, the magazine can be shot out different angle of the nail when the magazine guide bar snaps into three different angle of slots, the design is just like three different pneumatic nailers in one piece, it's no longer needs to buy any more pneumatic nailers to meet work needs, easy to use, time-saving and reduce the cost for buying tools.