Quantitative reagent adding device for sewage treatment

The utility model discloses a quantitative reagent adding device for sewage treatment, which comprises a sewage pool, electric sliding rails are arranged on both sides of the top of the sewage pool, first connecting blocks are fixedly connected to the sliding ends of the electric sliding rails, and connecting plates are fixedly connected to the sides, close to each other, of the two first connecting blocks. According to the device, a worker can conveniently observe the discharging amount, after the discharging amount reaches an index, a third electric valve and a first driving motor are closed through a controller, discharging is stopped, the discharging amount is conveniently mastered, a powdery additive and water are mixed firstly, then the mixture is discharged into a sewage pool, and the discharging amount is adjusted. The problem that the powdery additive floats on the water surface or adheres to the inner wall of the sewage pool after being added into the sewage pool, and the using effect of the powdery