Concrete anti-permeability instrument fixing device

The utility model relates to the field of instrument positioning, in particular to a concrete impermeability instrument fixing device which comprises a base and a fixing assembly. The fixing assembly comprises two sets of abutting pieces, and the two sets of abutting pieces are arranged at the two ends of the wide edge of the base correspondingly. The abutting piece comprises a mounting plate, a rotating disc, an abutting plate and a driving bolt. The mounting plate is connected to the base; the rotating disc is located at the end, close to the mounting plate, of the abutting plate and rotationally connected to the abutting plate. One end of the driving bolt penetrates through the mounting plate and is connected with the rotating disc, the driving bolt is in threaded connection with the mounting plate, and the end, away from the mounting plate, of the abutting plate can abut against the side wall of the concrete impermeability instrument. By the adoption of the technical scheme, the abutting plates abut again