The invention provides a graph drawing method and a device. The method comprises the following steps: receiving a graph drawing request, wherein the graph drawing request includes the shape of a graph to be drawn and the position of the graph to be drawn in a current graph, and first graph display data corresponding to the current graph is stored in a memory buffer; getting second graph display data corresponding to the graph to be drawn according to the shape of the graph to be drawn and the position of the graph to be drawn in the current graph; saving the second graph display data to the memory buffer; and sending a reading instruction to a graphics processing unit GPU, wherein the reading instruction is used to instruct the GPU to read the graph display data in the memory buffer to a frame buffer of a video memory. The graph drawing method and the device provided by the invention can improve the speed of graph drawing by a computer system.