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The present application relates to a kind of continuous casting machine quick replacement crystallizer's method, belong to steelmaking continuous casting equipment overhaul method technical field.The technical scheme of the present application is: using the track arrangement high leg single beam crane and low leg single beam crane of tundish car dismounts and installs crystallizer, in situ handheld electric handle operation;Crystallizer inlet valve and crystallizer backwater valve adopt pneumatic cut-off valve;Crystallizer replacement is divided into preparation, replacement and finishing three stages.The beneficial effects of the present application are: under the condition of guaranteeing safety, to improve the efficiency of replacing crystallizer, corresponding increase the time of continuous casting machine production.