The invention discloses a DC power supply system convenient for moving, which comprises a cabinet body and a guide rail system, wherein the cabinet body is used for accommodating a battery; the cabinet body is internally provided with a hoister; the bottom part of the cabinet body is provided with moving wheels; the guide rail system comprises two parallelly-arranged sliding grooves; the two sliding grooves are connected through a transverse plate; one end of the sliding groove is provided with an upper horizontal track, and the other end is provided with a lower horizontal track; the extending directions of the upper horizontal track and the lower horizontal track are opposite; and the sliding grooves and the moving wheels are matched. Through arranging the moving wheels at the bottom part of the cabinet body, the cabinet body can move flexibly; and besides, through arranging the guide rail system in lap joint with an engineering vehicle and through match between the sliding grooves and the moving wheels, the power cabinet body can flexibly move to the engineering vehicle, and the operation is simple and labor-saving.