The invention discloses a voltage regulation type energy-saving control circuit for a ventilation fan. The voltage regulation type energy-saving control circuit for the ventilation fan mainly comprisesa diode rectifier U, an amplifier P, a field-effect transistor MOS1, a field-effect transistor MOS2, a unidirectional thyristor VS, a thermistor RT, a switch SW, a triode VT1, a triode VT2, a triode VT3, a resistor R9, a polar capacitor C5 and a resistor R12, wherein one end of the resistor R12 is connected with an anode of the unidirectional thyristor VS, and the other end of the resistor R12 is grounded. According to the voltage regulation type energy-saving control circuit for the ventilation fan disclosed by the invention, the thermistor RT is a high-polymer ptc thermistor which has the characteristics of a self-recovery fuse, the current applied to the thermistor RT can be regulated in such a manner that the thermistor RT is combined with the peripheral current, the discontinuous power supply to the ventilation fan can be realized in a better manner, and therefore the problem that an electric motor of the ventilation fan is at a high temperature for a long term is solved effectively.