In-vitro diagnostic reagent

The invention discloses an in-vitro diagnostic reagent, comprising a reagent R1 and a reagent R2, wherein the reagent R1 comprises 20 to 100 mM of a buffer with a pH value of 7.0 to 9.0, a surfactant with a concentration of 0.01 to 2.0 g/L, a stabilizing agent with a concentration of 0.01 to 20.0 g/L and an aseptic, the reagent R2 comprises 20 to 100 mM of the buffer with a pH value of 7.0 to 9.0, an acceptable amount of latex particles coated by an antibody, the stabilizing agent with a concentration of 0.01 to 20.0 g/L and the aseptic, and the aseptic is allicin with a concentration of 0.8 to 2.0 g/L. The in-vitro diagnostic reagent has the advantages of anticorrosive effect and no inhibitory effect on a reaction substrate.