Stepless adjustable platform door base

The utility model provides a platform door base capable of being adjusted steplessly, which comprises a regular T-shaped mounting plate and an inverted T-shaped mounting plate, the regular T-shaped mounting plate comprises a first transverse plate and a first vertical plate, the lower surface of the first transverse plate is vertically and fixedly connected with the first vertical plate, the inverted T-shaped mounting plate comprises a second transverse plate and a second vertical plate, and the upper surface of the second transverse plate is vertically and fixedly connected with the second vertical plate; a rack is arranged on the first vertical plate, threads on the outer wall of the adjusting knob are matched with the rack, the adjusting knob is arranged in a rectangular hole of the second vertical plate and connected with the second vertical plate through a pin shaft, and the pin shaft longitudinally penetrates through a shaft hole of the adjusting knob. A guide groove is formed in the side, close to the