The present invention discloses a coal-fired unit primary frequency modulation function implementation method in a non-coordinative mode. A unit is operated in a non-coordinative mode, and a primary frequency modulation control logic I is employed at a DEH side; primary frequency modulation control logic II is output and overlapped by a steam turbine manual operator at a CCS side, the primary frequency modulation function is commonly achieved at the CCS side and the DEH side, and the primary frequency modulation is normally input and quitted in various work conditions. The defects can be solved in the prior art, and safety and stability of unit operation can be ensured.