The invention provides a parallel graphics rendering method based on sort-first load balancing. The method comprises steps of enabling a server node to subject the first frame of a graph to be rendered to screen division according to an average division principle, and to assign the divided parts to the rendering nodes to complete parallel rendering and then to achieve splicing; enabling the server node to predict the load rendered in the next frame; establishing a binary tree of screen division rendered by the (i+1)th frame from top to bottom by using the screen as a root node, using respective rendering nodes as leaf nodes, and using the load predicted values rendered by the (i+1)th frames of respective rendering nodes as the weights of respective rendering nodes; assigning the screen rendering regions of the (i+1)th frames to respective rendering nodes; and enabling a graph synthesis node to perform graphic splicing and synchronous output after respective rendering nodes performs parallel rendering. The method adopts a multi-frame joint forecasting method and similarity between sort-first frames, accurately predicts the next frame load and improves the parallel rendering efficiency.