The utility model provides an optical non-radioactive mixed sand concentration measuring device which comprises a tee joint structure with unions at two ends, movable sealing connecting fasteners arranged at two ends of a straight joint with the unions, a front end connected with a sand pump end of a discharge main manifold of a sand mixing truck, and a rear end connected with a discharge end of the discharge main manifold, a transparent sealing plate is arranged at the bottom of the vertical port of the union, an optical aggregator is arranged on the transparent sealing plate, an infrared CCDarray sensor is arranged at the upper end of the optical aggregator, the optical axis of the optical aggregator is coaxial, and a cover plate is arranged at the upper end of the infrared CCD array sensor; a sealing pipe which is mutually sealed with the union straight-through part is arranged at the bottom of the port vertical to the union; and an infrared laser is arranged in the sealing pipe. According to the utility model, the accurate measurement of the concentration of the mixed sand is realized by utilizing an infrared laser reflection principle, and meanwhile, the safety risk and the management and control difficulty of a radioactive source during fracturing field operation can be eliminated.