The invention relates to a track-type sun-shading device, which comprises an installation unit, two track bar units, a sun-shading unit and two driving mechanisms which are respectively arranged near the two track bar units. Each driving mechanism comprises a seat body unit, a gear unit and a rotating shaft, wherein the seat body unit can be assembled onto the track bar unit at the same side in the manner of relative movement; the gear unit is arranged in the seat body unit; and the rotating shaft is connected with the gear unit. The gear unit comprises a transmission wheel capable of moving front and back on the surface of the track bar unit, whereas one end of the rotating shaft is connected with the gear unit; the other end of the rotating shaft is connected with one linkage shaft of the sun-shading unit; and the rotating shaft can be driven by the gear unit to drive the linkage shaft to rotate. The design of connecting the driving mechanisms with the linkage shaft is capable of preventing track clamping, and cord fabric can be smoothly expanded no matter the cord fabric is pulled to be expanded from the left side or the right side.