The invention belongs to the technical field of building cooling load control, relates to a method for predicting an office building cooling load, and through building an office building outdoor cooling load model, an office building indoor cooling load model and an office building fresh air load hourly variation model, an office building cooling load model is obtained. Based on the an energy conservation law and a thermal balance relation in building environment, from the point of view of variation of the number of people in an office building and personnel energy utilization modes, the interference amount of a cooling load in the office building is predicted and analyzed; and meteorological website data are utilized to predict a cooling load outside the office building and an office building fresh air load. The method for predicting the office building cooling load establishes an air conditioner enclosing structure, a solar radiation cooling load hourly variation model, and hourly variation models of personnel, equipment, illumination cooling loads and personnel indoor rate in air conditioning environment, and finally obtains a cooling load prediction model of the office building.