Switching circuit with large current protection

The utility model discloses a switching circuit with large current protection. Comprising a mechanical switch, a power supply input end, a first MOS tube, a second MOS tube and a power supply output end, the power supply input end is connected with a power supply and connected with one end of the mechanical switch, the other end of the mechanical switch is connected with a drain electrode of the first MOS tube, and a grid electrode of the first MOS tube is connected with a grid electrode of the second MOS tube. The grid electrode of the first MOS tube is connected to a 5V power supply through a first resistor and is grounded through a second resistor and a first capacitor, the drain electrode of the second MOS tube is connected to the 5V power supply, the source electrodes of the first MOS tube and the second MOS tube are connected with the power supply output end, and the joints of the source electrodes of the first MOS tube and the second MOS tube and the power supply output end are grounded through a third