Diffusion vessel horizontal fixing device and using method thereof

The invention discloses a diffusion vessel horizontal fixing device, belonging to the technical field of soil detection devices. The diffusion vessel horizontal fixing device comprises a base, a supporting rod, a lifting rod and a pressing board; the supporting rod uses a hollow straight rod, and is vertically fixed on the edge of the base; the lifting rod is L-shaped with a right angle; a vertical part of the lifting rod is inserted into the supporting rod, and can move inside the supporting rod up and down; the vertical part of the lifting rod is fixedly arranged through a fixing screw on the supporting rod; a screw rod is arranged at the middle position of a transverse part of the lifting rod; the screw rod can move at the transverse part of the lifting rod up and down; a screw rod handle is arranged at the upper end of the screw rod, and a flange is arranged at the lower end of the screw rod; the flange is sleeved inside a stopping tile; the stopping tile is fixedly arranged on the pressing board; the screw rod is connected with the pressing board through the stopping tile, and the pressing board is located in the horizontal direction; and the pressing board is located above the base and is opposite to the base. The diffusion vessel horizontal fixing device provided by the invention has the advantages of simple structure, convenience and security in use, and easiness in operation; and the technical problems that solutions of an inner chamber and an outer chamber are easily mixed as a diffusion absorption method is adopted for measuring alkali-hydrolyzale nitrogen content in soil, and consequently, the operation easily fails, are solved.