The invention discloses a multi-way water treatment valve with four valve cores, wherein a first valve core cavity, a second valve core cavity, a third valve core cavity, and a fourth valve core cavity are distributed and connected to a valve body; valve cores are rotationally connected in the valve core cavities respectively; water flow passage holes on the end surfaces of the bottoms of the valve cores are communicated with water flow passage holes on the end surfaces of the bottoms of the valve core cavities correspondingly in a diversion manner; and water holes are arranged on the valve body and communicated with water flow passages in the inner cavity of the valve body correspondingly. Two groups of water treatment devices are formed by connecting the valve cores in the first valve core cavity, the second valve core cavity, the third valve core cavity, and the fourth valve core cavity of the valve body, and the two groups of water treatment devices work simultaneously, thus effectively increasing the output flow of water treatment. The multi-way water treatment valve formed by integrally connecting the two groups of water treatment devices is connected and used with a single tank body, and obviously decreases the production cost of enterprises compared with the prior art.