The invention discloses a symmetrical hammering deicing mechanism of an overhead line deicing robot, which comprises a hammering mechanism and an ice cutter holder, wherein the hammering mechanism isprovided with two hammering mechanism bases which are identical in structure and arranged in a mutual mirror image manner, and the hammering mechanism is provided with hammering connecting rods capable of transversely sliding in a penetrating mode. One end of the hammering connecting rod is provided with a hammering portion, and the other end is provided with a convex block. The hammering connecting rod is provided with a spring plug pin, and a spring sleeves the hammering connecting rod. One side of each hammering mechanism base is provided with a cam shaft frame, and the cam shaft frame is rotatably provided with a cam shaft in a penetrating mode. One end of the cam shaft is sleeved with a first gear, and the other end is sleeved with a cam. A first rotating shaft is rotatably arranged between the two hammering mechanism bases in a penetrating mode, one end of the first rotating shaft is sleeved with a first worm, and the other end is sleeved with a second worm. The first worm and the second worm are respectively meshed with the first gears on the two hammering mechanism bases. The first rotating shaft is sleeved with a second gear. The hammering mechanism is provided with an icebreaking motor, a shaft of the ice breaking motor is sleeved with a driving gear, and the driving gear is mutually meshed with the second gear.