The invention relates to an anchor rod forcemeter for testing an underground engineering model. The anchor rod forcemeter comprises two trays and a cylindrical alloy pipe arranged between the two trays, wherein two anchor rod holes for enabling an anchor rod to penetrate through vertically are formed in the pipe wall of the cylindrical alloy pipe, an optical fiber grating strain sensor is fixedly arranged on the pipe wall of the cylindrical alloy pipe, and the optical fiber grating strain sensor is connected to an optical fiber grating data acquisition system through an optical fiber. When in use, the anchor rod is inserted into the anchor rod holes of the anchor rod forcemeter for testing the underground engineering model, the two trays are in contact with the cylindrical alloy pipe, external force is firstly applied for measuring an external force-strain curve, then the anchor rod is further driven into the model to be tested for measuring the actual strain, and the stress of the anchor rod is further obtained by comparing with the curve. The anchor rod forcemeter disclosed by the invention has the advantages of simple structure and convenience in use.