The utility model relates to a contacltess electronic DC contactor, which is composed of a controlling circuit which is composed of a large-power Vmos pipe and integrated packages NE555 and LM7805, wherein, a pulse transformer is used as a system element of the Vmos pipe, the secondary pulse of the transformer can be used as a conduction signal which is supplied to the control pole of the Vmos pipe after filleting by diodes D[1] and D[2], and the primary pole of the transformer is connected with the output end of the controlling circuit. Compared with other contactless switches, the utility model has the characteristic that the contacltess electronic DC contactor can keep a high speed switching status under the working condition of large current. The utility model has the unique advantages in the aspects of DC speed regulation, voltage regulation, program controlled reversing of electrochemical process, constant current and electric heating power regulation, and the utility model has the advantages of explosion proofing, no operation noise, half permanence and no maintenance and wide applying foreground in the self controlling field.