Starting circuit for preventing voltage instability

The utility model discloses a starting circuit for preventing voltage instability. Comprising an MOS tube, a grid electrode of the MOS tube is grounded through a first resistor and a second resistor which are sequentially connected in series, a single-chip microcomputer control signal is connected through the first resistor, a drain electrode of the MOS tube is connected with a load and connected between the first resistor and the second resistor through a first capacitor, a source electrode of the MOS tube is connected with a working power supply and is grounded through a second capacitor, and the second capacitor is an electrolytic capacitor. According to the utility model, when the MOS tube is switched on, the loaded load is large, and when the MOS tube is switched on and the working power supply is switched on, a large current needs to be increased, and at the moment, the second capacitor which is charged in the early stage serves as a battery to supplement the current of the working power supply; therefo