The utility model discloses an adjustable measuring device for testing fit in a shoe. The system comprises a foot model and a pressure sensor arranged on the foot model, the foot model comprises at least two groups of module assemblies, each group of module assemblies comprises at least one type of module body, and the module bodies in the module assemblies can be spliced with each other to form different types of foot models. According to the adjustable measuring device for testing the fit in the shoe, a foot model with an adjustable size can be provided; pressure sensors are arranged in a plurality of key areas of the foot, the foot-shoe matching degree can be accurately and effectively evaluated through a quantitative evaluation method, and therefore data support is provided for shoe product research and development and scientific research related to foot fitness improvement.