Safety sign fixing frame for underground powerhouse

The utility model provides a safety sign fixing frame for an underground powerhouse, and belongs to the field of auxiliary equipment of an energy storage power station. According to the technical scheme, the device comprises a mounting frame, a clamping assembly and an auxiliary fastening assembly, the clamping assembly and the auxiliary fastening assembly are arranged on the mounting frame, the mounting frame comprises a pair of telescopic rods, each telescopic rod comprises an outer sleeve and an inner sleeve rod inserted into the outer sleeve, a pair of mounting rods are arranged on the side face of each outer sleeve in an up-down mode, mounting plates are arranged at the ends of the mounting rods, and mounting holes are formed in the mounting plates; a transverse plate is arranged between the outer sleeves on the two sides, an auxiliary fastening assembly is arranged on the transverse plate, the clamping assembly comprises lower U-shaped clamping grooves formed in the side faces of the bottom ends of the