Sewage residual chlorine concentration detection device with function of adapting to sewage depth

The utility model discloses a sewage residual chlorine concentration detection device with a function of adapting to sewage depth, which belongs to the field of residual chlorine concentration detection devices and comprises a support and a residual chlorine concentration detection instrument body mounted on one side of the support, a rigid wire is wound on the outer surface of a rotating shaft, and a downward moving component is mounted at the tail end of the rigid wire. When the mounting disc moves downwards, the buoy floats on sewage, the movable ring slides on the outer surface of the mounting disc, when the mounting disc touches the water bottom, the rigid line arranged at the lower end of the buoy floats on the water surface, rotation of the rotating shaft can be stopped, the probe is placed in the placing hole, and the upper end of the probe is limited through the protective semi-ring. The protective semi-ring and the mounting disc are fixed through the bolt body, the motor is started, the coupler and