The invention discloses a courtyard indoor thermal environment analyzing method based on a CFD (Computational Fluid Dynamics) information technology. The courtyard indoor thermal environment analyzing method comprises the following steps of: at first, establishing an indoor thermal environment model according to a design drawing of a building structure; determining an airflow organizational way of an indoor thermal environment; setting boundary conditions and initial conditions of the indoor thermal environment, and calculating a temperature field, a wind speed field, an air age, a PMV (Predicted Mean Vote) value and a PPD (Programming Planning Directive) value through CFD simulative calculation; judging whether thermal comfort degree satisfies a pre-set value or not; if not, modifying and adjusting the thermal environment model; and finally, determining and outputting a final scheme of the indoor thermal environment model. The courtyard indoor thermal environment analyzing method provided by the invention simulates the courtyard indoor thermal environment of a large-scale shopping mall building by using a modern information technology and a computational fluid mechanics CFD technology; an optimal manner is selected by respectively analyzing, comparing and evaluating; the design can be improved; the construction debugging of a field air conditioning system can be guided; suggestions for revision can be provided for the points with an improper design; and the requirements on comfort degree, health, security and the like of the shopping mall building by people can be met.