The invention relates to a self-weight lock door structure for a waste cable recovery storage box and belongs to the field of containers. A door which is hinged to the main structure of the storage box is arranged at the bottom of the storage box and is connected with the bottom of the main structure of the storage box through a hinge. At least one door foot pad is arranged on the other side of the door. At least one locking block separating device is arranged at the position, corresponding to the door foot pad of the door, of the main structure of the storage box. Each locking block separating device comprises a handle and a locking block connected with the handle, wherein the locking block can be stretched forwards or retracted or backwards along with pushing or pulling of the handle. The self-weight lock door structure is applied to the bottom of the box, so that the locking block and the handle cannot be manually pulled out due to the self-weight pressure of a cable and the self-weight pressure of the door when the storage box is not on a load-bearing ground, automatic closing of a box bottom door in a load bearing state is realized, and the personal safety of operators is ensured when the box bottom door needs to be opened automatically for unloading. The self-weight lock door structure can be widely applied to the field of storage and transportation of waste cables.