The invention provides a rock generated hydrocarbon flow simulation device, which can be used to truly simulate the process of oil and gas generation in an organic-rich rock stratum of a formation and the process of emission of the generated oil and gas to an organic-poor rock stratum. The rock generated hydrocarbon flow simulation device of the invention comprises a hydrocarbon generation assembly, a constant-pressure balance assembly, and a switching component. The hydrocarbon generation assembly comprises a reaction kettle containing hydrocarbon source rock samples, a component for heating the reaction kettle, and a component for pressurizing the reaction kettle. The balance assembly is connected with the hydrocarbon generation assembly through a high-pressure pipeline, and comprises a container which is used for receiving oil and gas from the hydrocarbon generation assembly and contains porous rock samples. The switching component is arranged on the high-pressure pipeline, and is opened only when the pressure difference between the hydrocarbon generation assembly and the balance assembly exceeds a specified value.