The application discloses a UI map drawing method and device, a mobile terminal and a storage medium. The method comprises the following steps: when a first UI map corresponding to a target size to be loaded is received, it is detected whether any candidate map is matched; when the matching is successful, the matched candidate map is drawn; when the matching fails, the first UI map is drawn, a first target map is determined from all virtual maps, and the first UI map is merged into the first target map. The first target map is a virtual map having a free area matching the target size. If it is detected that the UI map does not match the existing virtual map, the UI map is merged into the free virtual map, the existing graphic storage space is reused, repeated loading is avoided, memory consumption is reduced, and simultaneously, since multiple UI maps can be merged into one virtual map, when there are multiple drawing requirements, the number of times of sending a drawing command to a GPU can be reduced, and game performance is improved.