The invention relates to an in-situ rotary bone fracture restoration fixer. The in-situ rotary bone fracture restoration fixer comprises two tong handles and a pair of fixing plates, wherein the two tong handles are mutually hinged together; the pair of fixing plates is used for clamping and fixing the bone fracture part; the back parts of the two tong handles are respectively provided with an elastic latch, the corresponding elastic latches are used for locking the distance between the pair of fixing plates, and the back ends of the two tong handles are uniformly provided with annular handles; the front ends of the tong handles are provided with arc-shaped tong heads, the ends of the tong heads are connected with the fixing plates through ball and socket shafts, and the two tong handles can be rotated with certain angle by the fixed bone under the condition of latching by the elastic latches; the inside surface of each fixing plate is provided with at least two positioning protrusions; the two tong handles and the pair of fixing plates can be detached at the ball and socket shafts. The in-situ rotary bone fracture restoration fixer has the advantages that the fixer can be rotated in situ, the operation space is reserved for the screwing of screws, and the different lengths and arcs of fixing plates can be selected and installed according to the size of backbone.