Portal frame structure with height adjusting function

The portal frame structure with the height adjusting function comprises supporting structures, each supporting structure comprises two supporting frames which are symmetrically arranged, the bottom of each supporting frame is fixedly connected with a strip-shaped base, and the bottom of each strip-shaped base walks on a track through a driving device. First mounting seats are fixedly connected to the tops of the two supporting frames, and two guide seats are symmetrically connected to the first mounting seats; an I-shaped supporting beam is arranged above the two supporting frames, a moving trolley is arranged at the bottom of the I-shaped supporting beam, strip-shaped supporting bases are fixedly connected to the bottom faces of the two ends of the I-shaped supporting beam, guide lifting rods are symmetrically and vertically connected to the bottoms of the strip-shaped supporting bases, and the guide lifting rods correspond to the guide bases one to one and penetrate through the guide bases; the top of the s