The invention discloses an efficient grinding method of a ballastless track plate. Two spindle boxes are arranged on a transverse beam in a numerically-controlled grinder; the two spindle boxes slide along motion sliding rails in the length direction of the transverse beam; the two spindle boxes correspondingly process widths of two half-edges of a rail bearing surface of the track plate respectively; rams in the spindle boxes move up and down vertically through the motion sliding rails which are arranged in the spindle boxes; a driving motor for driving a grinding spindle adopts a rated power of 150 Kw; and the motor operates to drive the grinding spindle to drive an integrally-formed grinding wheel to grind the two half-edges of the rail bearing surface of the track plate simultaneously. By the method, the integral one-step forming grinding of a rail bearing table of the track plate is realized, and the production efficiency of a machine tool is improved; the method has the advantages of high speed, high precision and high rigidity; meanwhile, gear marks cannot be formed on the rail bearing surface which is processed by the method; an error is small; and grinding precision of 0.1 mm can be achieved within an overall length range of 6,550 mm.