Modularized sound insulation device and sound insulation index adjusting method

The invention provides a modularized sound insulation device and a sound insulation index adjusting method. The modularized sound insulation device comprises a mounting module and a sound insulation module. Wherein the mounting module is formed by splicing a plurality of mounting units; the mounting unit is a square frame and comprises a front mounting surface and a rear mounting surface; the sound insulation module is formed by splicing a plurality of sound insulation units; the sound insulation unit is of a cuboid hollow structure; the sound insulation units are the same as the mounting units in size; the sound insulation unit is mounted on the mounting surface of the mounting unit; a medium inlet and a medium outlet are formed in one surface, adjacent to the mounting unit, of the sound insulation unit; the medium inlets of the multiple sound insulation units are communicated through pipelines to form an inlet pipeline, and the medium outlets of the multiple sound insulation units are communicated through p