The invention belongs to a subsidiary component of a door. The dark door absorption device is characterized by comprising a bolt component and a base, wherein the bolt component is arranged in an embedding hole on the end surface of the door bottom; the base is arranged on the floor; the bolt component is composed of a fixing sleeve, a bolt slider and a spiral spring; the fixing sleeve is provided with a sliding window hole and a flange; the bolt slider is located in the fixing sleeve; one end of the spiral spring is supported in a seat hole of the bolt slider, and the other end is supported on the inner wall of the fixing sleeve; the lower side end of the bolt slider passes through the sliding widow hole through a bolt tongue extending horizontally and protrudes out of the fixing sleeve; and the peripheral wall of the base is provided with a bolt hole matched with the shape of the bolt tongue. The dark door absorption device is of a simple structure, does not hook clothes or influence walking safety, and solves the technical problem of difficult observation through the door.