The invention belongs to the technical field of RH refining process automatic control, and discloses a control method for an RH vacuum processing mode, which adopts two-stage control software to modeling a charging system and an oxygen blasting system during the initial setting stage of the vacuum processing mode; through data communication between the two-stage control software and a one-stage basic automation control system, automatic control on oxygen blast, steel scrap and aluminum scrap can be realized during the initial setting stage of the vacuum processing mode; and after a control signal is given by the two-stage control software, the one-stage basic automation control system executes the control program as per the parameters transmitted by the two-stage control software, so as to realize automatic control and meets requirements for accurate control on molten steel temperature. The control method has the advantages of normalized production and high automation level.