The invention discloses a machining method for eliminating needle plate deformation. The machining method is characterized by comprising workpiece sawing, six-surface rough milling, rough hole punching, fine hole punching, hole detection and finish milling. The machining method creatively classifies holes in a needle plate to two types of rough holes and fine holes for the first time, adopts a two-step procedure of machining the fine holes after machining the rough holes, discards a traditional process of once punching, can effectively guarantee the needle plate to have no high deformation in a short time due to quick thermal alteration, can machine the holes in the needle plate in a dispersed manner by the two-step method, and guarantees no stress concentration of the needle plate to influence the mechanical performance.