The invention belongs to the technical field of DCS graphical algorithm configuration, In order to solve the technical problem of low system performance in the technical scheme of off-line simulationby calling GDB/MI interface, the invention provides an off-line simulation method and device of DCS graphical algorithm configuration, which realizes data access and algorithm control off-line simulation function through self-encapsulating simulation tool plug-in. The off-line simulation method comprises the following steps: (1) compiling a graphics algorithm corresponding to the graphics algorithm configuration into an algorithm program and an algorithm offset program; 2, load that algorithm program and the algorithm offset program into the memory by using an offline simulation plug-in, and realize simulation control and variable data operation by using the algorithm program and the algorithm offset program.