The invention provides a puncture locating system applicable to meniscus suture. The puncture locating system comprises a puncture needle (1), an optical fiber force sensor (2), a cavity (3), a near-end solenoid coil (4) and a far-end solenoid coil (5), wherein the optical fiber force sensor (2) is arranged on the tube wall at a far end part of the puncture needle (1), and iron powder is arranged in the cavity (3); the near-end solenoid coil (4), the cavity (3) and the far-end solenoid coil (5) are arranged sequentially. When the optical fiber force sensor detects that the far end of the puncture needle reaches a soft tissue interface, the iron powder is attracted to the near end and the far end of the cavity alternately, so that density distribution in the cavity is changed alternately, the far end part of the puncture needle in an ultrasonographic image is obviously different from other static parts, and the fact that the far end of the puncture end is located in the interface of the soft tissue at the moment can be known.