Reverse connection prevention circuit with switching function at positive input end

The utility model discloses an anti-reverse-connection circuit with a switching function at an input positive end. The anti-reverse-connection circuit comprises an anti-reverse-connection circuit, a charge pump circuit and a soft start current suppression circuit, one end of the anti-reverse-connection circuit is connected with the power supply output end, and the other end of the anti-reverse-connection circuit is electrically connected with the charge pump circuit; one end of the soft start current suppression circuit is connected with the power input end, and the other end of the soft start current suppression circuit is electrically connected with the charge pump circuit. The MOS tube VT2 is accessed to the circuit as an anti-reverse connection function and is cut off when the positive electrode and the negative electrode of the circuit are reversely connected, so that the anti-reverse connection function is realized; the voltage-regulator tube VD1 protects the grid voltage of the MOS tube VT1 and the MOS