On-machine laser direct detection device for profile accuracy of oil thread and measurement method

The invention discloses an on-machine laser direct detection device for profile accuracy of an oil thread. The device comprises a protective shell, a laser sensor, a mechanical bracket and a numerical control tool rack, wherein the laser sensor is arranged in the protective shell and is sealed by a sealing cover of the protective shell (2); the protective shell is arranged on the mechanical bracket; the mechanical bracket is arranged on a tool position of the numerical control tool rack. According to the direct detection device, the technical level and the quality level of oil thread detection are obviously increased, and the direct detection device has significant scientific research value, application value and social benefits.