The invention relates to a four-way reversing valve. The four-way reversing valve comprises a valve body and a valve core. The valve core seal is rotated and assembled in the cavity of the valve body. The upper side of the valve core has a connecting part for driving the motor. There are four through holes on the circumferential cavity wall of the valve body. The first through hole and the second through hole are arranged in the front and back directions. The third through hole and the fourth through hole are connected in the left and right directions. The valve core is equipped with the first passage, the second passage, the third passage and the fourth passage; when the valve core rotates relative to the valve body, it has two working positions, the first one is that the two ends of the first passage are respectively connected with the two adjacent through holes, and the two ends of the second passage are connected with the other two through holes; the second one is that the first through hole, the third through hole and the second through hole are connected, and the third through hole and the third through hole are connected. Four channels and the fourth through-hole are connected. The four-way reversing valve of the invention can operate under the condition of pressure difference or not, thus solving the problem that pressure difference must exist before operation.