Device and method for measuring tiny wear of precision cutter

The invention relates to a device and a method for measuring tiny wear of a precision cutter, and belongs to the technical field of diffraction measurement. The device comprises a first servo motor, a second servo motor, a laser, a pinhole filter, a collimating lens, a to-be-measured tool, a first standard tool, a tool fixing device, an electric coupling device, a computer, a fixed base and a second standard tool, the first servo motor and the second servo motor are fixedly installed on the fixed base, the first standard tool is installed on the fixed base, and the second standard tool is installed on the fixed base. The laser is installed on the first servo motor, the tool to be tested, the second standard tool and the first standard tool are in mirror image, the electric coupling device is installed on the second servo motor, the first servo motor and the second servo motor are electrically connected with the computer, and the computer is in communication connection with the electric coupling device. By mea