The invention discloses a cache updating method and device, and relates to the technical field of computers. One specific embodiment of the method comprises the following steps: determining an updating task in a cache queue by utilizing a tangent plane; determining an updating parameter corresponding to the updating task; and updating the to-be-updated data corresponding to the updating task intoa cache by utilizing a reflection mechanism and the updating parameters. According to the embodiment, the technical problems of too high coupling, poor code reusability, difficulty in mastering expiration time and invalid resource waste caused by possibly accessing a bottom-layer storage medium without reasons and executing updating operation when no data is updated due to the fact that codes forupdating caches need to be compiled in the prior art are solved; therefore, the technical effects of efficiently updating the cache and increasing the code reusability are achieved.