The invention discloses a cutting plate of a cutting machine with an inertial plate. The cutting plate comprises a saw cutting plate (1), an inertial plate (2), connecting bolts (3), a base (4), a base bearing (5), saw cutting sawteeth (10), a rotary shaft (11), an upper pressing cover (12) for positioning, a lower pressing cover (13) for positioning, a locking nut (18), an end screw (19) of the rotary shaft, an inner hole (20) of the upper pressing cover for positioning, a hexagonal hole (21) of the upper pressing cover for positioning and an inner ring (22) of the upper pressing cover for positioning. The cutting plate is characterized in that a movable blade (6) and a movable knife handle (7) are fixedly arranged on the rotary shaft (11) through movable knife fastening bolts (9); a stationary blade (8) is welded and fixed on the base (4); a notch (23) is formed in the inner hole (20) of the upper pressing cover for positioning; a notch is further formed in the inner hole of the lower pressing cover for positioning; a fastening pressing strip inner tongue (16) on a fastening pressing strip (14) extends into the notches (23) in the inner holes on the upper and lower pressing covers; outer locking strips (15) of the fastening pressing strip on the fastening pressing strip (14) are bent to press the locking nut (19).