The invention discloses a manufacturing method of a nickel/zinc cobalt alloy double-layer electroplated steel plate. The manufacturing method comprises the steps of firstly conducting scale removal and cleaning on a cold-rolled sheet steel plate with the thickness ranging from 0.4-2.5 mm, using 20-30% by mass of diluted hydrochloric acid to perform activation, performing nickel electroplating, conducting heat treatment on the steel plate plated with nickel under the conditions of the temperature ranging from 500 DEG C to 700 DEG C and annealing time of 0.3-2 hours, electroplating zinc cobalt alloy on the surface of the steel plate subjected to heat treatment after nickel plating, using water to wash the steel plate subjected to zinc cobalt alloy electroplating, then using chromate to perform electrochemical cathode passivating treatment, performing thorough water flushing after passivating treatment is completed, using hot air to blow and dry the steel plate so as to obtain a finished product, namely the nickel/zinc cobalt alloy double-layer electroplated steel plate. The electroplated steel plate manufactured by means of the manufacturing method overcomes the defect of 'white rust' of a zinc plated layer, so that the service life of the steel plate is remarkably prolonged, and the quality of the product is improved.