The invention provides a quasi full compensation laser feedback interferometer. The quasi full compensation laser feedback interferometer comprises a laser module outputting two laser beams which are in the same direction and are parallel, a light splitter used for transmitting the two beams of laser outputted by the laser module into first transmission light and second transmission light, a sound-light frequency shift module used for carrying out frequency shift of the first transmission light and the second transmission light, a gathering lens used for gathering the first transmission light and the second transmission light, a first diverging lens used for separating the first transmission light and the second transmission light after gathering, a collimation module used for collimating the first transmission light and the second transmission light after separation and making the first transmission light and the second transmission light after separation be parallel, a reference lens used for reflecting the first transmission light to return to a first laser device along an original path, a photoelectric detection module used for converting first reflection light and second reflection light into electric signals, and a signal processing system used for processing the electric signals inputted by the photoelectric detection module, wherein the second transmission light is reflected by a to-be-measured target to return to a second laser device along an original path. Through the quasi full compensation laser feedback interferometer, displacement of the remote distance to-be-measured target can be accurately measured.