The invention relates to a control method for emergency operation of a hydraulic system of furnace front three large machines and belongs to the technical field of automatic control. The problem that when a PLC system of the furnace front three large machines breaks down, the furnace front three large machines cannot continuously and stably operate is solved. Normal operation of hydraulic station equipment is rapidly achieved through control of conversion switches; a PLC control signal is cut off; the deceleration positions of the tapping machine and the clay gun machine are judged according to limiting switch signals; analog quantity signals are transmitted to a valve station proportional valve on the spot through signal transmitters so that the operating speed of the tapping machine and the operating speed of the clay gun machine can be changed; and thus, continuous and stable operation of the furnace front three large machines is ensured, the production process requirements are met, and sufficient time is also provided for processing a fault of the PLC system.