A next-time frequency modulation optimization method of a point-to-point direct power supply running mode belongs to the technical field of turbine control in power generation field. A non-differential frequency modulation loop is additionally arranged on a turbine group frequency modulation circuit of the prior art and comprises a primary frequency modulation non-differential correction PID controller, two parallel dead-zone link controls and an analogue AGC instruction correction PID controllers. Rotational speed deviation is employed, the PID controller is entered after the dead-zone link controllers are passed through, an output result, the rotational speed deviation in an original loop and a diversity factor calculation result of Delta set are superposed, the superposed PID controlleroutput is the non-differential correction loop, so that the constant frequency of a turbine master controller output under the working condition of a variable load is ensured, and meanwhile, the adjustment capability of primary frequency modulation is improved.