The invention relates to a webpage animation rendering method and device. The method includes the steps that the number of to-be-loaded elements of a webpage and the amplitude of a preset quantity threshold are detected; if the number of the elements is larger than the preset quantity threshold and a container of the elements comprises animation attributes, the animation attributes are deleted, and a new container is obtained; if the number of the elements is larger than the preset quantity threshold and the container of the elements does not contain the animation attributes, the container serves as a new container; if the number of the elements is smaller than or equal to the preset quantity threshold, animation attributes to be rendered are added into the container of the elements, and a new container is obtained; according to a preset data loading mode, the elements are loaded to the webpage, and corresponding animation rendering is performed when the new container contains the animation attributes. The webpage animation rendering method and device automatically adapt to and reasonably load the corresponding animation effect and improve webpage using experience of users.