The invention discloses a method for testing stress and deformation of meshes of a fishing net, and relates to fishing net physical performance tests. The invention provides a method for testing transverse stress and geometrical deformation of meshes of the net when the net is subjected to longitudinal stress. The method takes and prepares a sample, and performs test programming and fishing net mesh stress and deformation test according to test requirements through system settings of a testing machine. The method is characterized in that: the testing machine pulls a fishing net sample at a speed of 200cm/min by dragging a steel wire and a moving arm; a sensor of the testing machine tests and records longitudinal stress dynamic values and a peak value of meshes of the fishing net sample; aforce transducer on a bracket also synchronously records transverse stress dynamic values and a peak value of corresponding meshes of the fishing net sample; an image shooting device above the fishing net sample synchronously acquires integral, local or single-mesh continuous images or pictures of the fishing net sample; and geometrical deformation data of the meshes of the fishing net are acquired through image data processing.