A reversing valve , comprising a pilot valve and a main valve ; the main valve comprises: a valve body with a valve chamber , wherein the valve chamber is provided with a valve seat therein, and the valve seat is provided with five valve ports thereon; five flow path ports (51-55)are correspondingly communicated with the five valve ports, characterised in that the valve chamber is cylinder-shaped; the first valve port , the second valve port , the third valve port , the fourth valve port and the fifth valve port are set at one side of the valve chamber, and are linearly distributed in the axis direction of the valve chamber ; a sliding valve core is matched with the valve seat ; and a drive component driving the sliding valve core to selectively open or close the valve ports, wherein, the five valve ports comprise a first valve port , a second valve port , a third valve port , a fourth valve port , and a fifth valve port ; the five flow path ports (51-55) comprise an S port which is communicated with the first valve port , an E port is communicated with the second valve port , a C port is communicated with the third valve port , a D1 port is communicated with the fourth valve port and a D2 port is communicated with the fifth valve port ; when the sliding valve core slides to a first preset position, the D1 port is communicated with the E port , and the S port is communicated with the C port, a medium entering through the D2 port is enclosed in the valve chamber ; when the sliding valve core slides to a second preset position, the D2 port is communicated with the C port, and the S port is communicated with the E port, a medium entering through the D1 port is enclosed in the valve chamber . a valve body with a valve chamber , wherein the valve chamber is provided with a valve seat therein, and the valve seat is provided with five valve ports thereon; five flow path ports (51-55)are correspondingly communicated with the five valve ports, characterised in that the valve chamber is cylinder-shaped; the first valve port , the second valve port , the third valve port , the fourth valve port and the fifth valve port are set at one side of the valve chamber, and are linearly distributed in the axis direction of the valve chamber ; a sliding valve core is matched with the valve seat ; and a drive component driving the sliding valve core to selectively open or close the valve ports, wherein, the five valve ports comprise a first valve port , a second valve port , a third valve port , a fourth valve port , and a fifth valve port ; the five flow path ports (51-55) comprise an S port which is communicated with the first valve port , an E port is communicated with the second valve port , a C port is communicated with the third valve port , a D1 port is communicated with the fourth valve port and a D2 port is communicated with the fifth valve port ; when the sliding valve core slides to a first preset position, the D1 port is communicated with the E port , and the S port is communicated with the C port, a medium entering through the D2 port is enclosed in the valve chamber ; when the sliding valve core slides to a second preset position, the D2 port is communicated with the C port, and the S port is communicated with the E port, a medium entering through the D1 port is enclosed in the valve chamber . <EOS>