Linear gas cutting device

The utility model provides a linear gas cutting device, which relates to the technical field of gas cutting devices and comprises a linear frame, antiskid teeth are arranged at the bottom end of the linear frame, sliding rails are arranged on two sides of the linear frame, lubricating components are arranged at the inner wall ends of the upper ends of the sliding rails, and a heat dissipation plate is inserted in the middle section of the linear frame. A gas cutting machine is arranged in the middle of the sliding rail, an injection head is arranged at the top end of the gas cutting machine, a supporting frame is arranged at the rear end of the injection head, and an extension assembly is connected to the top end of the supporting frame. The extension assembly comprises an electric telescopic rod, a scale rod, clamp frames and bolts, the electric telescopic rod is connected to the top end of the supporting frame, and by starting the electric telescopic rod, the moving positions of the spraying heads can be ex