The invention provides an anti-carbonation quenching distortion control method of a large-size dual-herringbone gear. The anti-carbonation quenching distortion control method comprises the steps thatan existing carburizing and quenching tool is changed into a three-point supporting tool, before quenching charging after carburization, the upper face and the lower face of the gear are exchanged, and metallographic structure examination and the carburizing and quenching process parameter improvement after heat treatment are prepared. The anti-carbonation quenching distortion control method is used for the large-size dual-herringbone carburizing and quenching gear of a turbocompressor. According to the carburizing and quenching gear controlled through the anti-carbonation quenching distortioncontrol method, the deformation amount of the whole carburizing and quenching process is reduced by above 50%, the gear deformation amount is greatly reduced, the gear quality is greatly improved, the contact fatigue strength and bending fatigue are greatly improved, the grinding amount is reduced, and the cost is greatly reduced.