The invention relates to a component of an adjustable valve, in particular to a valve spool of the adjustable valve and an adjustable valve structure made by the valve spool. The valve spool of the adjustable valve comprises a valve rod and the valve spool supporting against a valve body structure. The valve spool is composed of a valve spool seat and valve flaps fixed on the valve rod, wherein, a surface supporting against the valve body structure is arranged on the valve spool seat and a plurality of valve flaps are arranged at the side of the surface supporting against the valve spool seat at a circumferential direction. The valve flaps are in parallel with the valve rod. Space between neighboring valve flaps becomes wider and wider gradually from the bottom part to the tip of the valve flaps. The valve spool of the adjustable valve of the invention is provided with the quincunx valve flaps, thus thoroughly changing the round structure of traditional valve spools. Compared with thetraditional adjustable valves that can only play roles of conduction through or closing, the structure of the invention can realize the adjustment, control and stability of flux by changing the space between the valve flaps, thus realizing free adjustment to the flux and best results.