Recovery system and recovery method

The invention provides a recovery system and a recovery method. The recovery system comprises a condensing unit and an adsorption/desorption unit; a non-condensable gas and a condensed liquid are obtained after a reducing tail gas passes through the condensing unit, and the outlet of the condensing unit is connected with a non-condensable gas output pipe and a condensed liquid output pipe; the adsorption/desorption unit is connected with the non-condensable gas output pipe, and is used to separated hydrogen from the non-condensable gas; a desorption gas is obtained after the non-condensable gas passes the adsorption/desorption unit and is subjected to adsorption and desorption; the outlet of the adsorption/desorption unit is connected with the hydrogen output pipe and the desorption gas output pipe, the hydrogen output pipe is connected with an inlet of a polysilicon reduction system, and the desorption gas output pipe is connected with an inlet of a silicon tetrachloride hydrogenation system. The above recovery system avoids frequent heating and cooling of a liquid chlorosilane material, reduces consumption of cold quantity and heat in a drying-process recovery system, avoids cold quantity waste generated when hydrogen chloride in the non-condensable gas returns to the recovery system, and also avoids impurity enrichment.