Density gradient centrifugation sample injection detection device

The utility model belongs to the technical field of biological sample detection, and particularly relates to a density gradient centrifugal sample injection detection device which comprises a sample injection needle, an ultraviolet spectrophotometer flowing cuvette and an injection pump, the sample injection needle is communicated with an upper connector of the ultraviolet spectrophotometer flowing cuvette, and the injection pump is communicated with a lower connector of the ultraviolet spectrophotometer flowing cuvette. And a lower interface of the flow cuvette of the ultraviolet spectrophotometer is communicated with an inlet of the injection pump. The upper-inlet and lower-outlet flow path design overcomes the influence of a liquid mixing phenomenon during replacement of each component when a density gradient centrifugal sample is injected in a lower-inlet and upper-outlet mode of a flowing cuvette of an ultraviolet spectrophotometer. The device is driven by the injection pump, compared with a traditional