Plant carbon sink storage method based on waste strip mine

The invention discloses a plant carbon sink storage method based on a waste strip mine, which comprises the following steps: S1, selecting a construction horizon; s2, constructing a bottom water-resisting layer on the bottommost layer of the construction layer; s3, the connecting dam body, the closed dam body and the two side dam bodies enclose a carbon sink reservoir; s4, the carbon sequestration reservoir is divided into a plurality of subareas by the multiple middle dam bodies; s5, gas exhaust pipelines are preset in the subareas; s6, plants are laid in the subareas close to the side dam body and compacted, sealing layers are constructed on the tops of the subareas, and strip mine dumping operation is conducted on the upper portions of the sealing layers to form a dumping site; and S7, a waste water well with the top penetrating out of the ground is built in the middle dam body, and the bottom of the waste water well penetrates through the two adjacent subareas. According to the plant carbon sink storage method based on the abandoned strip mine, the straw is buried in the mine pit, occupied space is reduced, meanwhile, a high-temperature and high-pressure sealed environment is provided for the straw through the dead weight of rock soil on a dumping site, decomposition is accelerated, and the carbon sink effect is improved.