The utility model provides a mesh stress testing device. The mesh stress testing device comprises a bracket, a sleeve, a lifting device, a three-component sensor and a mesh fixing frame, the bracket is fixed on the outer side wall of the sleeve; the sleeve is arranged on the outer side of the lifting device in a sleeving manner; the lifting end of the lifting device is connected with one end of the three-component sensor through a first connecting plate; and the other end of the three-component sensor is connected with the mesh fixing frame through a second connecting plate. The testing devicefor the stress of the mesh is simple in structure and convenient to operate, the stress conditions of the mesh in the x direction, the y direction and the z direction in an experimental water area are directly measured, measurement errors and calculation errors are greatly reduced, the experimental efficiency is improved, and the experimental cost is reduced.