The invention provides a high power mixed direct current contactor and a method thereof, the invention is composed of a direct current contactor main body and an arc extinguishing system. The direct current contactor comprises a movement contact, a main body bracket, an electromagnetic coil and other parts, completing switching effect. The arc extinguishing system comprises a contactor closed electric arc eliminating part and a contactor disconnection arc extinguishing part. The closed electric arc part of the mixed direct current contactor is composed of a electric source switching circuit, a signal separating and collecting circuit, a control circuit and a MOSFET drive circuit; electric power electric switch is switched on and the jumping electric arc is removed by detecting the contactclosed signal; the disconnection process contact electric arc eliminating part is composed of a maintaining circuit, a judging circuit, a control switch circuit and an energy absorbing circuit, utilizing the absorption property of the electric power capacitance energy to eliminate the electric arc generated when the contactor contact breaks the high power load; design of a PCB plate distribution is optimized to reduce the influence of parasitical parameters to a maximum extent, enabling the high power mixed direct current contactor to completely eliminate the influence of the electric arc in the process of breaking operation.