The invention discloses a liquid flushing type multi-channel switching channel valve assembly, which comprises a valve body. A water inlet cavity, a water outlet cavity and a water drain cavity are formed in the valve body; a flow guide part I for communicating the water inlet cavity with the water outlet cavity, a flow guide part II for communicating the water outlet cavity with the water drain cavity, and a valve core assembly for controlling the alternate switching on and switching off of the flow guide part I and the flow guide part II are arranged at the junction of the water inlet cavity, the water outlet cavity and the water drain cavity; an elastic cavity which is connected with the valve core assembly and a pressure control mechanism for regulating the internal pressure of the elastic cavity are also arranged on the valve body; and due to the regulation of the pressure control mechanism, the elastic cavity expands and contracts to drive the valve core assembly to slide between the flow guide part I and the flow guide part II in a reciprocating mode, so that the alternate switching on and switching off of the flow guide part I and the flow guide part II is realized. Channel switching is finished in a pressure regulation mode, but pressure change is realized by controlling an electromagnetic valve; and the liquid flushing type multi-channel switching channel valve assembly has the advantages of simple structure, convenient control, no investment in equipment such as an air source and the like, and low manufacturing cost.