The invention provides a load optimization control method based on an air conditioner electricity utilization mode. The method includes the steps that (1) according to a first-order thermal dynamic model of a constant-frequency air conditioner, a time-varying function relationship of the indoor temperature is established; (2) according to characteristics of the constant-frequency air conditioner, the duty ratio of the working state of the air conditioner is determined in combination with an indoor temperature control interval set according to user preference; (3) a human comfort satisfaction degree quantification model and an electricity utilization cost economy quantification model are built; (4) an optimization model of the comprehensive satisfaction degree of users is built according to the human comfort satisfaction degree and the electricity utilization cost economy; and (5) comprehensive control strategies of the air conditioner electricity utilization mode are built. According to the load optimization control method based on the air conditioner electricity utilization mode, the function relationship of real-time electricity price and the working mode of the air conditioner is fitted out according to concrete implement situations of the real-time electricity price of a power grid platform and practical operation situations of the constant-frequency air conditioner, and the operation mode of the air conditioner is optimized by adjusting changes of the real-time electricity price from the power grid level.