The invention discloses a large-pole plate long-time cycle lead anode two-step electrolytic refining method. The method comprises 1, anode plate and cathode starting sheet preparation: pretreating a lead bullion, carrying out vertical mold-based casting to obtain an anode plate and preparing a cathode starting sheet from a lead roil through a cathode sheet preparation machine, 2, primary electrolysis: arranging the cathode starting sheet and the anode plate through an automatic spacing machine, putting the cathode starting sheet and the anode plate into an electrolytic cell, supplying direct currents and carrying out electrolysis in an electrolyte of the additive-containing silicofluoric acid and lead fluorosilicate aqueous solution for 3-4 days, and 3, secondary electrolysis: taking the anode plate subjected to electrolysis in the step 2, cleaning the surface of the anode plate to remove anode mud, putting the anode plate into the electrolytic cell, carrying out electrolysis for 3-4 days, and taking out the cathode and the anode scrap so that an electrolytic period is finished. The method greatly reduces a residual anode rate and DC power consumption, keeps electrolyte lead acid concentration balance, is environmentally friendly and clean, can be operated simply and conveniently and creates high economic benefits.