The invention relates to the field of medical instruments and more particularly relates to a surgical-posture positioning device. The surgical-posture positioning device comprises a lower supporting plate, vertical-rod fixing seats and positioning vertical rods, wherein the vertical-rod fixing seats are arranged on the lower supporting plate; and the positioning vertical rods are inserted to the vertical-rod fixing seat. The lower supporting plate is formed by splicing supporting units; each supporting unit is provided with crossed fixing-seat sliding channels; each vertical-rod fixing seat comprises a seat body and a seat cover, through holes are arranged under the seat body; an inserting hole is formed in the seat cover; the seat body is internally provided with a cam-rod locking mechanism; the cam-rod locking mechanism comprises a cam rod and a locking pin penetrating into the through hole. Each positioning vertical rod comprises an inserting seat, an inserting piece and a rod body; the inserting piece is inserted into the inserting seat which is connected with the seat cover; the inserting piece connected with one end of the rod body; the inserting seat comprises an inserting seat base and an inserting seat cover arranged on the inserting seat base. The surgical-posture positioning device has the advantages that the surgical-posture positioning device can be disassembled into multiple small units by the idea of finite element analysis, the lower supporting plate can be spliced into any size, and the positioning vertical rods can be assembled into any angle and any length.