Four-rail sample conveying device

The utility model discloses a four-rail sample conveying device which comprises a biochemical front/back rail used for carrying and conveying a sample rack holding samples, a rail transformation mechanism used for transforming the rail position of the sample rack, a sample stepping mechanism for pushing the sample rack to move in the rail, a separation blade mechanism for positioning the sample rack in the rail position, and a sample push-out mechanism for pushing the sample rack out of the rail; the biochemical front/back rail comprises four conveying rails, namely a first rail, a second rail, a third rail and a fourth rail, wherein the first rail and the second rail are used for conveying samples for biochemical detection, the third rail is used for conveying samples for chemiluminescence detection, and a fourth rail used for reclaiming samples. Firstly, samples enter the first rail and/or the second rail for biochemical detection, secondly, the sample push-out pushes the sample rack out of the fourth rail