The utility model discloses a cold electromagnetism drain valve of doing machine, which comprises the following components: a valve body, be equipped with first drainage hole on the valve body and be used for control the electric magnetic component of first drainage hole switching, be equipped with the floater in the valve body, work as rise to on the floater and to trigger during the position of electricity magnetic component circular telegram, the circular telegram of electricity magnetic component makes first drainage hole opens, when the floater drops to and to trigger during the position of electricity magnetic component outage, the outage of electricity magnetic component makes first drainage hole closes, still be equipped with the second outlet on the valve body, the 2nd drain connection has manually -operated valve. Adopt the utility model discloses a cold electromagnetism drain valve of doing machine can move the discharge with the sailor in the valve body under the condition that first drainage hole can't open.