The invention discloses a vapor-recovery unit of a hot-water curing pot, which comprises a water tank, a vapor circulation tank, a water pump, a vapor inlet pipe, a gas outlet pipe and a circulating-water conveying trough, wherein a perforated plate is set in the vapor circulation tank; water is pumped from the water tank into the vapor circulation tank through the circulating-water inlet; circulating water is dripped below a perforated plate through the perforated plate; and a vapor circulation channel is set under the perforated plate. A vapor inlet and a gas outlet are set in the vapor circulation tank, and vapor enters the vapor circulation channel through the vapor inlet; a sealing plate is set at the vapor inlet pipe and the gas outlet pipe; a circulating-water outlet is set below the gas outlet; the circulating-water outlet is connected to the circulating-water conveying trough; and sprayed water is discharged to the water tank through the circulating-water outlet along the circulating-water conveying trough. The use of the vapor-recovery unit of the hot-water curing pot can effectively decrease or realize no heating steam discharge. The use of the vapor-recovery unit of the hot-water curing pot can protect safety of field environment and production equipment, protect operators against vapor scalding and realize safety production.