Reagent reaction tank with sharp bottom

The utility model discloses a reagent sharp-bottom reaction tank which comprises a plurality of clamps, three reagent reaction tanks for mixing a biological specimen extraction reagent and a biological specimen are arranged on the clamp in a penetrating manner, the three reagent reaction tanks are respectively a cylindrical reaction tank, a pyramid reaction tank and a polygonal reaction tank, the bottoms of the three reagent reaction tanks are respectively arranged to be of different inwards-shrinking conical structures, and a fixing part is arranged on the side of the pyramid reaction tank at the bottom of the clamp. And fasteners are arranged on the side edges of the polygonal reaction tank. Therefore, the fixing device can be fixed to or separated from the automatic biological specimen extraction instrument through the fixing piece and the buckling piece; and the inner shrinkage conical bottoms of the pyramid reaction tank and the polygonal reaction tank adopt asymmetric eccentric design, so that the vacuu