The invention discloses an electric vehicle direct current charging control guiding auxiliary circuit and a system and a controlling method. The electric vehicle direct current charging control guiding auxiliary circuit comprises a connecting interface 1, a connecting interface 2, a connecting interface 3 and a connecting interface 4, wherein the connecting interface 1 and the connecting interface 2 are arranged at a non vehicle-mounted charging machine end, the connecting interface 3 and the connecting interface 4 are arranged at an electric vehicle end; a monitoring point 4 and a resistance R8 are sequentially arranged between the connecting interface 2 and a positive pole of a pull-up power supply U1 of the non vehicle-mounted charging machine; a resistance R7, a switch K8 and a monitoring point 3 are in series connection between the connecting interface 1 and the positive pole of the pull-up power supply U1 of the non vehicle-mounted charging machine, wherein the monitoring point 3 is not directly connected with the pull-up power supply U1; a monitoring point 5 and a resistance R9 are sequentially arranged between the connecting interface 3 and a protective earthing line PE of the electric vehicle; a resistance R10, a switch K9 and a monitoring point 6 are in series connection between the connecting interface 4 and the protective earthing line PE of the electric vehicle, wherein the monitoring point 6 is not directly connected with the protective earthing line PE of the electric vehicle; during working, the connecting interface 3 is electrically connected with the connecting interface 1, and the connecting interface 4 is electrically connected with the connecting interface 2.