Detector for absolute position of elevator lift car

The invention discloses a detector for the absolute position of an elevator lift car, comprising an elevator dragging mechanism, an elevator downlink overspeed protection mechanism, a first rotary encoder and a second rotary encoder, wherein the elevator dragging mechanism is composed of a motor traction sheave, a guide pulley, a lift car side suspension sheave, a counter weight side suspension sheave, a lift car, a guide rail and a counter weight; the elevator downlink overspeed protection mechanism is composed of a speed limiter, a speed limiter tightening device and a lift car side downlink overspeed safety gear; the first rotary encoder is installed on the revolving shaft of the traction sheave and is used for feeding back motor control speeds and magnetic pole positions; and the second rotary encoder is installed at any unrestricted pulley by which a main steel wire rope for hoisting the lift car passes. The detector provided by the invention is safe and reliable, and has high measurement precision, and the rescue efficiency is improved.