The invention provides a rapid saccharin sodium detection kit which is characterized by comprising an extracting agent, an acid solution of methylene blue and accessories such as a reaction bottle, a suction tube and a sampling spoon, wherein the extracting agent is a mixed reagent of trichloromethane and ethanol; the volume percentage of the ethanol in the extracting agent is 1-2%; the concentration of the methylene blue solution in the acid solution of the methylene blue is 4*10<-3>-0.16mol/l; the acid medium in the acid solution of the methylene blue is one of acid solutions such as sulfuric acid and hydrochloric acid; the hydrogen ion concentration of the acid medium is 0.01-4mol/l. A detection method of the rapid saccharin sodium detection kit adopts the mixed reagent of trichloromethane and ethanol as the extracting agent, so that the detection sensitivity is greatly improved, detection values have large developing gradients, whether a detected sample is within a qualification or not can be very accurately judged, and moreover as the stability of the trichloromethane is improved and the volatility is degraded, the rapid saccharin sodium detection kit is relatively easy to preserve and transport.