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The invention relates to an ethylene cryogenic separation method for a large-sized ethylene device. The method includes the steps that mixed gas is precooled, cooled by a series of coolers and separated by a component separation container so that a gas phase and multi-strand liquid phases can be obtained; the gas phase is separated by a series of plate-fin heat exchangers and a component separation container so that a gas phase and multi-strand liquid phases can be obtained, after the pressure of liquid phase methane is reduced, cooling capacity is recycled through the heat exchangers, the liquid phase methane is conveyed to a downstream system, one of the multi-strand liquid phases and the liquid phase methane after pressure reduction are mixed, the rest of the liquid phases enter a demethanizer, and coarse hydrogen products enter the downstream system; the two firstly-coagulated liquid phases in the multi-strand liquid phases respectively enter a pre-demethanizer, and the rest of the liquid phases respectively enter the demethanizer; the pre-demethanizer separates the liquid phases into gas and liquid, the gas is delivered to the demethanizer, and the liquid is delivered to the downstream system; the demethanizer separates the gas phase into methane and C2 which are delivered to the downstream system, and the methane is delivered to the downstream system. By means of the ethylene cryogenic separation method for the large-sized ethylene device, 30% of the size of a cold box is decreased, equipment and cost are reduced, energy saving and cost reduction are achieved, and operating stability is guaranteed.