A foldable stroller frame, comprising: a front wheel bracket; a rear wheel bracket, rotatably connected to the front wheel bracket; a side handrail, rotatably connected to an upper end of the rear wheel bracket; a rear supporting bar, rotatably connected to the rear wheel bracket at a first position of the the rear wheel bracket; a push bar, rotatably connected to the side handrail and the rear supporting bar by different shafts; a slidable sleeve, disposed on the rear wheel bracket; a front wheel bracket link, wherein a first end of the front wheel bracket link is rotatably connected to the slidable sleeve, and a second end of the front wheel bracket link is rotatably connected to the front wheel bracket; and a side handrail link, wherein a first end of the side handrail link is rotatably connected to the slidable sleeve, and a second end of the side handrail link is connected to the side handrail; characterized in that, the foldable stroller frame further comprises a first supporting bar, a second supporting bar, a third supporting bar and a fourth supporting bar, wherein, the first supporting bar and the secnd supporting bar are rotatably connected to each other at middle portions of the first supporting bar and the secnd supporting bar; a first end of the second supporting bar is rotatably connected to a first end of the fourth supporting bar, a second end of the second supporting bar is rotatably connected to a first end of a second wheel bracket link of the front wheel bracket link, a second end of the fourth supporting bar is rotatably connected to a first end of a first wheel bracket link of the front wheel bracket link; and a first end of the first supporting bar is rotatably connected to a first end of third supporting bar, a second end of the first supporting bar is rotatably connected to a second end of the first wheel bracket link of the front wheel bracket link, a second end of the third supporting bar is rotatably connected to a second end of the second wheel bracket link. a front wheel bracket; a rear wheel bracket, rotatably connected to the front wheel bracket; a side handrail, rotatably connected to an upper end of the rear wheel bracket; a rear supporting bar, rotatably connected to the rear wheel bracket at a first position of the the rear wheel bracket; a push bar, rotatably connected to the side handrail and the rear supporting bar by different shafts; a slidable sleeve, disposed on the rear wheel bracket; a front wheel bracket link, wherein a first end of the front wheel bracket link is rotatably connected to the slidable sleeve, and a second end of the front wheel bracket link is rotatably connected to the front wheel bracket; and a side handrail link, wherein a first end of the side handrail link is rotatably connected to the slidable sleeve, and a second end of the side handrail link is connected to the side handrail; characterized in that, the foldable stroller frame further comprises a first supporting bar, a second supporting bar, a third supporting bar and a fourth supporting bar, wherein, the first supporting bar and the secnd supporting bar are rotatably connected to each other at middle portions of the first supporting bar and the secnd supporting bar; a first end of the second supporting bar is rotatably connected to a first end of the fourth supporting bar, a second end of the second supporting bar is rotatably connected to a first end of a second wheel bracket link of the front wheel bracket link, a second end of the fourth supporting bar is rotatably connected to a first end of a first wheel bracket link of the front wheel bracket link; and a first end of the first supporting bar is rotatably connected to a first end of third supporting bar, a second end of the first supporting bar is rotatably connected to a second end of the first wheel bracket link of the front wheel bracket link, a second end of the third supporting bar is rotatably connected to a second end of the second wheel bracket link.