The application discloses can prevent undulant throttle current stabilizer of air current contracts stifledly including connecting the body and two throttles, and the center that connects the body is provided with a axial through's cavity, and two throttles contract the stifled packing of interference respectively at the both ends of cavity, and every throttle contracts stifled center and all is provided with an axial shrinkage cavity and a toper chamber, and two toper chambeies set up in opposite directions. The contained angle that is between the toper generating line in every toper chamber and the chamber wall is 135. The diameter of section of cavity is 6mm, and the length of cavity is 30mm. The diameter that every throttle contracts stifled well axial shrinkage cavity is 1mm, and the length of every axial shrinkage cavity is 5mm. After adopting above -mentioned structure, utilize the stationary flow cavity that connects internal portion and form, carry out the buffer memory to the air current, reduce the fluctuation of air current, play the effect of throttle stationary flow, avoid the shake of manometer pointer to overcome the piston type air compressor when the steep rise of pump wind stage atmospheric pressure, the shortcoming of the manometer pointer shake that the air current fluctuation leads to.