The invention relates to a rolling shutter type diaphragm device for a circulating water culture pond. The rolling shutter type diaphragm device for the circulating water culture pond comprises a round fishpond, a round bracket bottom, a plurality of support rods, a round bracket top and a pair of cone winding drums; the bracket bottom is fixed at the upper end of the fishpond, the plurality of support rods are evenly distributed at the periphery of the bracket bottom, the lower end of the support rod is fixed with the bracket bottom, the upper end of the support rod is fixed with the bracket top, the bracket top and the bracket bottom are coaxially arranged, an annular upper slideway guide strip inclining downwards is arranged at the periphery of the bracket top, an annular lower slideway guide strip inclining upwards is arranged at the periphery of the bracket bottom, and a slideway groove is formed between the support rod and the upper/lower slideway guide strip; the cone winding drum is detachably fixed on the two sides of one support rod, the large end of the cone winding drum is positioned at the lower part, the small end of the cone winding drum is positioned at the upper part, an inner core of the winding drum is embedded in the slideway groove after being unfolded, the pair of the cone winding drum are respectively connected with the two sides of the support rod at the other end; a top thin film is fixed in the bracket top. The rolling shutter type diaphragm device for the circulating water culture pond can change the cone winding drums with different inner cores, and is quite convenient.