The invention discloses a machining method of wear-resistance lining plate alloy steel, and belongs to the field of wear-resistance lining plates. The machining method of the wear-resistance lining plate alloy steel comprises smelting, pouring, forging and a heat treatment process; and the heat treatment process comprises the following steps: (1) annealing: wear-resistance lining plates are heatedto 850-870 DEG C, then, are insulated, and are cooled after insulation; (2) surface layer chemical heat treatment: the wear-resistance lining plates treated in the step (1) are put in a chemical medium for heating to change surface chemical components and structures; (3) quenching: the wear-resistance lining plates treated in the step (2) are heated to 350-380 DEG C for insulation, and then, arequickly cooled; and (4) the wear-resistance lining plates treated in the step (3) are heated to 500-650 DEG C for insulation, and then, are cooled in water; and finally, fusion welding of cobalt basealloys is performed on molded wear-resistance lining plate alloy steel. The wear-resistance lining plate alloy steel treated by the heat treatment process greatly improves the hardness, the strength and the wear resistance, and prolongs the service life exponentially.