Land methane emission automatic monitoring device

The invention relates to the technical field of land methane emission monitoring, in particular to an automatic monitoring device for land methane emission. Comprising a base, a vertical rod, a supporting plate, a mounting frame, a methane laser telemeter, a protection box, two cover plates and a storage assembly, the storage assembly comprises a lifting part, a driving part, a bidirectional threaded rod, two sleeves, two pulling ropes, two torsional springs and a guide roller, the lifting part is located in the protection box, the mounting frame is connected with the lifting part, the driving part is located in a cavity, and the bidirectional threaded rod is connected with the two sleeves. One end of the two-way threaded rod is rotationally connected with the protection box, the other end of the two-way threaded rod is connected with the driving part, the two sleeves are in threaded fit with the two-way threaded rod, the two guide rollers are symmetrically arranged in the cavity, and the two ends of each tra