The invention discloses a method for judging the surface chromium metal content of a chromium-plated plate. The method comprises the following steps that: firstly, selecting a chromium-plated plate specimen; removing a chromium oxidation layer on the surface of the chromium-plated plate specimen; then, taking the chromium-plated plate specimen as an anode and a platinum wire as a cathode, carryingout constant current electrolysis in electrolyte sodium carbonate solution, recording a voltage value, marking voltage at the beginning as E1, along with electrolysis reaction, raising the voltage, subsequently, sharply increasing the voltage, when the voltage hardly changes, finishing electrolysis, finishing electrolyzing all surface metal chromium layers of the chromium-plated plate specimen, and recording voltage E2; and finally, calculating a voltage difference [Delta]E=E2-E1 before and after electrolysis to realize the semi-quantitative analysis of a chromium-plated amount of the surfaceof the chromium-plated plate. By use of the device, the measurement of the surface chromium-plated amount can be carried out on any position of the surface of the chromium-plated plate, and the distribution evenness of the surface metal chromium of the chromium-plated plate can be accurately judged.