Advertising screen for metro marketing

The invention relates to the technical field of subway advertising equipment, in particular to a subway marketing advertising screen which comprises a protective shell and an advertising screen body, the advertising screen body is mounted in the protective shell, the protective shell is mounted in a subway wall, a limiting frame is welded to the outer side of the protective shell, and a contraction groove is formed in the side face of the protective shell; a pair of sliding grooves are formed in the inner side of the contraction groove in a vertically symmetrical mode, lifting grooves are formed in the side face of the protection shell in a left-right symmetrical mode, a rectangular groove is formed in the lower end of the protection shell, and a circular groove is formed in the lower end of the side face of the protection shell. And then by rotating a crank, a main bevel gear drives a transmission bevel gear to rotate, a rotating shaft drives a gear ring to rotate, the gear ring drives a toothed plate to mov