Sampling backwashing system

The utility model discloses a sampling backwashing system which comprises a clean water main pipe, a water valve is arranged on the clean water main pipe, the clean water main pipe is connected with a plurality of clean water branch pipes, each clean water branch pipe is connected with a sampling pipe, the inlet end of each sampling pipe is connected with a sampling primary valve, and the outlet end of each sampling primary valve is connected with a sampling secondary valve. The outlet end of each sampling pipe is connected with a sampling secondary valve, and the outlet end of each sampling secondary valve is connected with a sampling connecting pipe; each sampling pipe is connected with a sewage discharge branch pipe, and each sewage discharge branch pipe is connected to a sewage discharge header pipe. According to the sampling backwashing system provided by the utility model, the sampling pipe can be backwashing in time after sampling is finished every time, so that the sampling pipe is prevented from bein