The invention relates to an elastic beam type side wall frictional resistance dynamometer belonging to the technical field of measuring equipment. The elastic beam type side wall frictional resistance dynamometer solves the problems that the frictional resistance test of the prior art has low precision and resolution, is influenced by the soil pressure and cannot fix the friction force direction and the like, and comprises an embedded plate, a panel, an elastic beam, a strain gauge and a protective box; the embedded plate and the panel are arranged in parallel; the embedded plate is fixedly connected to one end part of the protective box; the panel is connected to the other end part of the protective box; the panel can translate and dislocate relative to the embedded plate; the elastic beam and the strain gauge are arranged in the protective box; two ends of the elastic beam are respectively and fixedly connected with the panel and the embedded plate; and two ends of the strain gauge are respectively and fixedly connected with the embedded plate. The elastic beam type side wall frictional resistance dynamometer can be used for measuring the frictional resistance between side wallsof objects of a rigid strucurue, such as sunk shafts, driven piles and the like, and surrounding soil bodies or can be used for indoor soil engineering tests and other special occasions.