The utility model provides a laser welding clamp for a heating pipe. The laser welding clamp comprises an operating desk. A two-dimensional plane mobile platform is arranged on the operating desk and provided with a clamping compressing mechanism. A lifting mechanism is arranged in the side direction of the operating desk. A temperature control pipe fixing mechanism is arranged between the lifting mechanism and the clamping compressing mechanism. According to the laser welding clamp for the heating pipe, the mature high-precision mobile platform, a precision cylinder movement combination, guiding sliding way sliding blocks, the lifting mechanism, the heating pipe fixing mechanism and the like are adopted, so that the laser welding clamp has the advantages of being small in size, and convenient and flexible to operate.