Novel high-temperature-resistant air cylinder

A novel high-temperature-resistant air cylinder comprises a cylinder barrel and a piston rod, the front end of the cylinder barrel is connected with a front cylinder cover in a sealed mode, the rear end of the cylinder barrel is connected with a rear cylinder cover in a sealed mode, the piston rod penetrates through the front cylinder cover to be installed in the cylinder barrel, and the rear section of the piston rod is sequentially provided with a front buffering sleeve, a piston and a rear buffering sleeve from front to back. The outer wall of the piston is provided with two V-shaped sealing rings and a guide belt which are used for being connected with the cylinder barrel in a sliding and sealing mode, and the guide belt is located between the two V-shaped sealing rings. The front buffering sleeve and the rear buffering sleeve can achieve a good buffering effect, the front buffering sleeve, the rear buffering sleeve, the V-shaped sealing ring, the O-shaped sealing ring and the guide belt are all made of f