The invention relates to a cold roll tool steel machining method, and belongs to the technical field of metallurgy. The cold roll tool steel machining method includes the following steps that (1) electric-arc furnace EBT primary melting, LF refining, VD vacuum degassing and pouring are carried out to obtain a cold roll tool steel electrode blank; (2) the cold roll tool steel electrode blank is subject to annealing, cleaning is carried out after annealing and furnace discharging, electroslag remelting is carried out after cleaning to obtain a cold roll tool steel electroslag steel ingot, the obtained cold roll tool steel electroslag steel ingot is subject to annealing again, cleaning is carried out after annealing and furnace discharging, and a cold roll tool steel annealing steel ingot is obtained; (3) the cold roll tool steel annealing steel ingot is contained in a furnace for heat preservation, preheating and heating, then forging is carried out, annealing treatment is carried out after forging, and a cold roll blank is obtained; and (4) the cold roll blank obtained in the step (3) is subject to hardware finish and flaw detection, and a cold roll blank is obtained after it is checked to be qualified. The product produced through the machining method is fine and dispersed in carbide distribution and long in service life.