Testing device for researching tolerance fit of industrial building components

The invention relates to a testing device for researching tolerance fit of industrial building components. The testing device comprises two fixed walls connected with each other, two movable walls connected with each other in an abutting mode, a bottom plate and a top plate, wherein the bottom plate and the top plate are provided with intersecting tracks. The two movable walls are connected with the adjacent fixed walls in an abutting mode. Each movable wall comprises a plurality of wall units which are vertically arranged side by side. Each wall unit can move along the corresponding track. Matching pieces which are matched with each other to enable the adjacent wall units to be fixed to each other are arranged between the adjacent wall units. Each wall unit comprises a first wall body, asecond wall body and a third wall body which are connected in sequence. The second wall bodies are connected with the first wall bodies through rotating pieces so that the second wall bodies can be turned over relative to the