A water quality express-analysis device of multi parameter includes an express-analysis device, the first accessory to load reagent, heating device and the second accessory to load the sampling device. The invention can determine many water samples quickly by integrating the apparatus and the reagent in the accessory. So it can get the content of the residue chlorine, the all chlorine, the ClO2, the chloride, the Cr6+, Mn, Ca, Fe, Al, Cu, Zn, Cd, Pb, Hg, Se, Na, Arg, Ti, Ba, Be, Boron, Ni, Mo, molybdenum, the fluoride, the sulfide, the cyanide, the whole phosphor, the ammonia nitrogen, the solving oxygen, the oxygen cost, the volatile hydroxybenzene, the anion, the chroma, the smell, the opacity, the ozone, the nitrate, the nitrite nitrogen, the bromate, the sulfate, the chlorite, the acrylamide, the formaldehyde and the pH.