Present invention refers to integrated ultraviolet-visible absorbing/fluorescence two-purpose flow-through cell, referring to liquid chromatograph detector. It includes cell body, light guide quartz capillary, polyetheretherketone liner tube, self-focusing lens, seal washer, gasket, optical fiber and liquid flow path pipeline. Said Light guide quartz capillary is set in polyetheretherketone liner tube and filled in pipe cavity of cell body, self-focusing lens set in light entry direction fixed and sealed with cell body by seal washer, gasket located between self-focusing lens and polyetheretherketone liner tube, gasket notch aligned flow path direction to fill excess space, entry optical fiber, outlet optical fiber and in and out liquid pipe respectively fixed in cell body by joint and sleeve chuck to form sealed flow path.