The invention provides a plastic spraying gun less prone to blockage. The plastic spraying gun comprises a plastic spraying gun body, a plastic powder storage bottle, a powder-gas mixing auxiliary device and a flame stabilizer. The plastic spraying gun comprises a gun barrel and a gun grip, the gun barrel is provided with a combustible gas guide-in passage, a powder-gas mixing cavity, a mixed gas delivery passage, an exhaust passage and a plurality of oxygen guide-in passages. The powder-gas mixing auxiliary device comprises a first communication tube and a spiral rod, the plastic powder storage bottle and the combustible gas guide-in passage are communicated through the first communication tube, and the spiral rod is mounted in the powder-gas mixing cavity and coaxial with the same. The flame stabilizer comprises a flame stabilizing frame and an ignition device, the flame stabilizing frame is detachably mounted on the gun barrel and positioned at the exhaust passage, and the ignition device is mounted on the flame stabilizing frame. The plastic spraying gun is convenient to use and effective in improvement of plastic spraying effects.