The utility model discloses a continuous adsorption regeneration device for hydrogen in a polycrystalline silicon tail gas recovery system. Two gas inlets and a gas outlet are respectively formed at the tops of two adsorption towers; the two gas inlets are respectively connected with the gas outlets of an electric heater and a nitrogen cooler in parallel connection through a pipeline, and the gas inlets of the two devices in parallel connection are respectively connected with a nitrogen inlet pipe; the gas outlets at the tops of the two adsorption towers are connected with a pure hydrogen outlet pipe through a pipeline and connected with a hydrogen compressor through a hydrogen backflow pipe; a gas outlet of the hydrogen compressor is connected with the nitrogen inlet pipe; a gas inlet and two gas outlets are also formed in a tower kettle of the adsorption tower, wherein the gas inlet is connected with a tail gas inlet pipe, and the two gas outlets are connected with a waste gas electric heater and a waste gas cooler in series connection; and the waste gas electric heater and the waste gas cooler in series connection are connected with a waste gas outlet pipe. By integrating the heating, cooling and replacement, the device disclosed by the utility model realizes alternate adsorption and desorption regeneration of the two adsorption towers in continuous operation, and three adsorption tower devices are completely replaced to perform continuous operation.