The invention relates to a numerical simulation method for the temperature and thickness relation of a static thrust bearing gap oil film based on film thickness variation, and belongs to the technical field of fluid mechanics simulation, which aims at solving the problems that as the thickness variation of the oil film is not taken into account in the traditional static thrust bearing internal fluid numerical simulation method, the temperature number simulation result of the oil film is lower the actual number. The method comprises the following steps of: establishing a static thrust bearinggap oil film female model and carrying out pretreatment; simulating the flow-state numerical value of the oil film; guiding the averaged temperature of the rotary wall surface of the oil film and thetemperature of an appointed fixed wall surface of the oil film after simulating the numerical value; calculating the new thickness value of the oil film by utilizing the relation of the temperature of the oil film and the temperature of lubricating oil; judging whether the new thickness value of the oil film, obtained in the step, is less than the critical temperature of the oil film or not; returning the thickness of the oil film as the thickness initial value of the oil film and then continuously executing subsequent steps; repeatedly calculating until the thickness of the oil film reaches the critical value of the oil film; and obtaining a final pressure field distribution cloud picture and a final temperature field distribution cloud picture of the oil film. The method is suitable fornumerical value simulation of a static thrust bearing gap oil film.