The invention relates to a tibia fracture fixator. The tibia fracture fixator comprises a horizontal fixing plate, a plurality of first gears are arranged on the fixing plate in a horizontally rotatable mode and distributed in the length direction of the fixing plate, vertical sliding grooves corresponding to the first gears are formed in the fixing plate, and a slider and a spring which is arranged on the slider are arranged in each vertical sliding groove; a rectangular through hole running forward and backward is formed in each slider, the rear portions of the first gears are arranged in the rectangular through holes respectively, compression semi-rings under the sliders are installed on the sliders respectively, and the compression semi-rings are hinged to the sliders through balls respectively. A vertical rotary shaft above each ball is arranged on the corresponding slider, the upper end of each rotary shaft penetrates through the corresponding slider, and the lower portion of each rotary shaft is in threaded connection with the corresponding slider. A second gear and an eccentric gear on the second gear are arranged in each rectangular through hole, the second gears mesh withthe first gears respectively, the second gears and the eccentric gears are in vertical sliding connection with the rotary shafts respectively, slidable racks are arranged on the fixing plate and canmesh with the first gears respectively, and adhesive tape buckles arranged on the front side and the rear side respectively are arranged on each slider.