The thermal distortion experimental device of three-dimension, high accuracy and multiple function comprises temperature measuring and controlling system, supporting and adjusting system, micro-deformation measuring system and aiming and positioning system. It is characterized by setting the box of constant temperature & humidity and thermometry circuit and by installing two-dimensional work bench in the box and by employing two-frequency laser interferometer in the micro-deformation measuring system. In the aiming and positioning system, one side of the length rod is fixed with electric inductance probe unit, and another is fixed with X workbench.