Tracing system and tracing method for range finding precision of laser range finder

The invention discloses a laser range finder ranging precision traceability system comprising a laser range finder, the laser range finder is coaxially provided with a simulation laser, a first beam splitter is arranged between the simulation laser and the laser range finder, and a second beam splitter is arranged between the laser range finder and a detector. The first detector and the analog laser are both in signal connection with the delay controller, the first beam splitter and the second beam splitter are both in signal connection with the second detector, and the second detector is connected with the oscilloscope. According to the traceability system and traceability method for the ranging precision of the laser ranging machine, a traceability chain is simplified by introducing measurement means such as a high-speed photoelectric detector oscilloscope on the basis of a photoelectric delay method, and the ranging precision is directly traced to a time standard and can reach 0.2 ns in an ms-level measure