The invention discloses a closed type high-temperature metal part afterheat recovery plant, belonging to the technical field of crossing of industrial afterheat recovery and a heat pump system. The closed type high-temperature metal part afterheat recovery plant disclosed by the invention mainly comprises a plant body with an insulating layer, a material inlet installed on the plant body, a high-temperature metal part cooling chamber, a material holding platform installed in the high-temperature metal part cooling chamber, a heat pump heat exchanging system, a built-in air duct system and an online monitor and control system. By adoption of the closed type high-temperature metal part afterheat recovery plant, high-temperature air can be introduced to the heat pump heat exchanging system by the built-in air duct system to exchange heat between the high-temperature air and the heat pump working medium circularly so as to effectively recover afterheat for generating electricity, supplying hot water and satisfying other needs. The closed type high-temperature metal part afterheat recovery plant disclosed by the invention has the advantages of high afterheat utilization rate, high heat supply efficiency, convenience in operation, safety and reliability in running, environment friendliness and no pollution. The closed type high-temperature metal part afterheat recovery plant is, in particular, suitable for recovering scattered and intermittent afterheat in a high-temperature air cooling process in steel-making, iron-making, forging and other thermal treatment industries.