Single-bearing reflection type absolute value encoder

The utility model relates to a single-bearing reflective absolute value encoder, which comprises a shell, a main shaft, a reflective optical element, a flange, a movable grating and a main body mounting seat, the main shaft is rotationally connected to the main body mounting base through a bearing, the reflective optical element is mounted on the upper end face of the main body mounting base, the flange is mounted on the lower end face of the main body mounting base, the movable grating is fixedly connected to the main shaft, and the reflective optical element comprises a light source and an optical detection chip which are mounted on the main body mounting base; the main shaft drives the movable grating to rotate, the movable grating reflects an optical signal to the optical detection chip, and the optical detection chip is used for converting the optical signal reflected by the movable grating into data corresponding to the position and sending the data to an upper computer through the terminal; the utility