The invention relates to a latex enhanced turbidimetric immunoassay kit of quantitatively detecting procalcitonin PCT. The kit comprises an R1 reagent, an R2 reagent and a calibrator, wherein the R1 reagent comprises a protecting agent, a reaction enhancing agent, a preservative and buffer solution; the R2 reagent comprises a protecting agent, a preservative, buffer solution and anti-human PCT antibody coated sensitization polystyrene latex particles; the calibrator comprises a protecting agent, a preservative, buffer solution and PCT recombinant protein; the human PCT antibody in the R2 reagent is linked with polystyrene latex particles through streptavidin-biotin; and the particle diameter of the latex particles in the R2 reagent is 40-500 nm. The kit can be used on a biochemical analyzer and a scatter turbidimetry analyzer for quantitatively detecting the PCT content in human blood. The invention provides the PCT detection kit which has the advantages of convenience, quickness, high sensitivity, strong specificity and accurate quantification; and the kit has high instrument compatibility, is low in detection cost and meets the requirements on PCT turbidimetric products in clinical use.