Disassembly-free backwashing water purification system

The utility model provides a disassembly-free backwashing water purification system which comprises a filter A, a filter B, a first valve, a second valve, a third valve, a fourth valve, a water inlet, a water inlet pipe, a purified water outlet, a purified water outlet pipe, a sewage draining exit and a sewage draining pipe, the first valve is arranged on a water inlet pipe connected with the water inlet and the filter A, the second valve is arranged on a water inlet pipe connected with the water inlet and the filter B, the third valve and the fourth valve are respectively arranged on a blow-off pipe connected with the filter A and the filter B and the blow-off port, and the water inlet pipe and the blow-off pipe are communicated with the outer sides of filter membranes in the filter A and the filter B; the purified water outlet pipe is respectively connected with the purified water outlet and the filter A as well as the purified water outlet and the filter B, and the purified water outlet pipe is communicate