Surge voltage protection circuit applied to vehicle air conditioning system

The utility model discloses a surge voltage protection circuit applied to a vehicle air conditioning system. The surge voltage protection circuit comprises a voltage stabilizing circuit module, a comparison circuit module and an execution circuit module, the comparison circuit module comprises a voltage comparator, the anti-phase end of the voltage comparator is connected with the positive electrode of the power supply through a second divider resistor, and the in-phase end of the voltage comparator is connected with the positive electrode of the voltage-stabilized power supply through a third divider resistor so as to form reference voltage; the output end of the voltage comparator is connected with the execution circuit module; the execution circuit module comprises a metal oxide semiconductor field effect transistor group which is connected in parallel, the grid electrode of the metal oxide semiconductor field effect transistor group is connected with the output end of the voltage comparator, the source el