The invention discloses a real-time soft shadow generation method and device for a resource-limited mobile device. The method comprises the following steps: configuring a three-dimensional scene in the mobile device and various input information required by the three-dimensional scene and creating a shadow map and a depth texture; A first GPU is used to program a pipeline to draw a three-dimensional scene, and the depth information of the encoded three-dimensional model surface closest to the light source is saved into a shadow map. The second GPU programmable drawing pipeline is used for Gaussian blur filtering, and the encoded blur depth information is updated into the shadow map to obtain the blurred shadow map. The third GPU programmable rendering pipeline is used to render the three-dimensional scene, and the soft shadow information contained in the blurred shadow map is rendered to the display window, so as to obtain the soft shadow result in the GPU pixel shader of the third GPUprogrammable rendering pipeline. As that invention is implemented, the lifelike three-dimensional scene soft shadow effect can be drawn on the resource-limited mobile device, and the real-time generation efficiency is improved.