The invention belongs to the field of pile foundation projects, and relates to an embedding and testing method for an optical fiber grating sensing system in a PHC tubular pile forming process. An optical fiber grating sensor and an optical fiber guide wire are tied onto a force-bearing reinforcing steel bar through thin iron wires, and the optical fiber guide wire is guided out through an open slot piston; the guided-out optical fiber end head is firstly coated by electrical insulation tape in the PHC tubular pile forming process, and then is coated with high-temperature-resistant adhesive tape; and during test, the optical fiber end head is connected with an optical fiber grating data acquirer. In a high-temperature normal-pressure production process for a PHC tubular pile, the optical fiber grating sensor and the optical fiber guide wire can be successfully embedded and tested directly and conveniently, and therefore, the embedding and testing method is worthy of being popularized in testing of the PHC tubular pile.