Material microscopic stress testing system

The invention discloses a material microscopic stress testing system which is established with a microscopic transmission difference spectroscopy method (mu-TDS). The whole testing system comprises a linear polarization laser source (1), a light phase modulator (2), a chopper (3), a focusing objective lens (41), a collecting objective lens (42), a polarization analyzer (6) and a signal collecting system (7). A computer is used for controlling point-by-point scanning and collecting processing data. By measuring the light intensity reflection ratio difference delta T/T in two directions which are perpendicular to each other on the surface of materials, stress distribution of the tested materials is obtained, the negative influence from an existing testing system can be avoided, damage on the materials is avoided, and the stress distribution situation of the materials is represented in a small range. A testing process is simple and quick, and testing accuracy is high.