The invention relates to an electromagnetic type normally-closed three-position and four-way reversing valve, comprising a valve body, a first slide valve, an overflow system and an electromagnetic driver, wherein a valve core cavity is arranged in the valve body, the first slide valve adapts to the valve core cavity, and an evacuation flow channel is also arranged in the valve body. The electromagnetic type normally-closed three-position and four-way reversing valve is characterized in that one end of the valve body is also provided with the electromagnetic driver, a first plane with an input flow channel is perpendicular to a second plane with an output flow channel, and the first plane with the input flow channel is perpendicular to a third plane with the evacuation flow channel. The invention has the advantage of greatly reducing the volume of the middle of the reserving valve, avoiding the problem that more spaces at both ends of the reserving valve are occupied in the scheme of installing a second slide valves at both sides by adopting the mode of installing the electromagnetic driver at the single side, and being convenient for electricians to connect wires.