A fully automatic light initiated chemiluminescence detector, comprising a sample loading module, a sampling arm module, an incubation disk module, a reagent disk module, a reagent arm module and a detection module, wherein a sample in the sample loading module is transferred to a reaction cuvette by means of the sampling arm module; after the reaction cuvette arrives at a specified position, the reagent arm module transfers a reagent in the reagent disk module to the reaction cuvette; the sample and the reagent in the reaction cuvette are mixed to be incubated at the incubation disk by a mixing mechanism; and after the incubation, the detection module sends light on a substance to be detected in the reaction cuvette to initiate a reaction between the sample and the reagent, and detects a luminescence signal generated after the initiation, characterized in that the fully automatic light initiated chemiluminescence detector further comprises a cuvette sorting module and a cuvette delivering module located between the cuvette sorting module and the incubation disk module, the cuvette sorting module being configured to sort disordered reaction cuvettes into ordered reaction cuvettes, which are delivered to the incubation disk module in sequence via the cuvette delivering module, and wherein the cuvette delivering module comprises a slide rail, a cuvette holding device slidably connected to the slide rail, a transmission device for controlling a movement of the cuvette holding device along the slide rail, a slide channel located below the cuvette holding device, and a reset device enabling the reset of the cuvette holding device, the cuvette holding device being configured to control a movement of the reaction cuvette, so that the cuvette is delivered horizontally directly from the cuvette sorting module through the slide channel to the incubation disk module. wherein a sample in the sample loading module is transferred to a reaction cuvette by means of the sampling arm module; after the reaction cuvette arrives at a specified position, the reagent arm module transfers a reagent in the reagent disk module to the reaction cuvette; the sample and the reagent in the reaction cuvette are mixed to be incubated at the incubation disk by a mixing mechanism; and after the incubation, the detection module sends light on a substance to be detected in the reaction cuvette to initiate a reaction between the sample and the reagent, and detects a luminescence signal generated after the initiation, characterized in that the fully automatic light initiated chemiluminescence detector further comprises a cuvette sorting module and a cuvette delivering module located between the cuvette sorting module and the incubation disk module, the cuvette sorting module being configured to sort disordered reaction cuvettes into ordered reaction cuvettes, which are delivered to the incubation disk module in sequence via the cuvette delivering module, and wherein the cuvette delivering module comprises a slide rail, a cuvette holding device slidably connected to the slide rail, a transmission device for controlling a movement of the cuvette holding device along the slide rail, a slide channel located below the cuvette holding device, and a reset device enabling the reset of the cuvette holding device, the cuvette holding device being configured to control a movement of the reaction cuvette, so that the cuvette is delivered horizontally directly from the cuvette sorting module through the slide channel to the incubation disk module.