The utility model relates to the field of heaters. The invention relates to a mounting fixture, in particular to a spiral heater. The device comprises a mounting base, the transmission frame, the mounting frame and the base are arranged; A mounting frame is mounted in the middle of the base. guide columns are symmetrically mounted on the front side and the rear side in the mounting frame; a firsthydraulic machine is mounted on the mounting frame between the two guide columns; A transmission plate is installed between the two guide columns, second hydraulic machines are transversely installedon the front side and the rear side of the left surface of the transmission plate, a transmission frame is arranged on the left sides of the two second hydraulic machines, and a fixing clamping plateis installed on the surface, away from the installation frame, of the installation base. In the utility model, by arranging the first hydraulic machine, the second hydraulic machine and the mounting seat, the working range of the device is enlarged, the mounting station is convenient to adjust, the mounting quality is ensured, and the device is novel in design concept and scientific in design, hashuge economic benefits and wide market prospects, and is worthy of popularization and application.