The invention discloses a microprocessor sleeping and awakening circuit, comprising an energy-saving control signal acquisition circuit and a resetting control circuit, wherein the energy-saving control signal acquisition circuit is provided with a resistor R5 and an on/off key K1 which are mutually electrically connected, the interruption pin of a microprocessor U2 is connected between the resistor R5 and the on/off key K1, one end of the resistor R5 is connected with a high level, and one end of the on/off key K1 is grounded; and the resetting control circuit is provided with an onkey K2, one end of the onkey K2 is electrically connected with the high level, the other end of the onkey K2 is electrically connected with the resetting pin of the microprocessor U2, the resetting pin is electrically connected with a resistor R1, a capacitor EC1 and an on-off element Q1, one end of the resistor R1 and one end of the on-off element Q1 are grounded, and the on-off element Q1 is electricallyconnected with the microprocessor U2. The circuit provided by the invention has the advantages of simple structure, low cost and high reliability.