Sewage detector

The utility model discloses a sewage detector which comprises an equipment main body, a detection head connected with the equipment main body and a holding rod located at the upper end of the detection head, a protective cylinder is sleeved on the outer side of the holding rod, a plurality of sliding blocks are fixedly connected on the inner wall of the protective cylinder, and a plurality of sliding grooves matched with the sliding blocks are arranged on the outer side of the holding rod. The multiple sliding blocks are slidably connected with the multiple sliding grooves correspondingly. A hanging mechanism is arranged between the top end of the protection cylinder and the holding rod, a plurality of through holes are formed in the outer side of the protection cylinder and are all communicated with the interior of the protection cylinder, the bottom end of the protection cylinder is fixedly connected with a bottom block through a plurality of connecting rods, and the bottom block is located at the bottom en