The utility model discloses a collapsible formula hydraulic cyclone belongs to heterogeneous class of splitter, including feed inlet, overflow pipe, whirl chamber, disengagement zone, underflow pipe etc. The disengagement zone is main mask work part, a serial communication port, the disengagement zone form by the shell of column nested contact of several different internal diameters. Swirler disengagement zone length has certain influence to the separation precision. The device can be according to the separation required precision of material adjustment swirler disengagement zone length, promptly when required separated substance's concentration demand changes, can be directly or the length of contracting swirler disengagement zone shell of column tensile according to the demand in order reaching the operation requirement, and new hydraulic cyclone of redesign again. This hydraulic cyclone's throughput increase, separation efficiency improves, the increase of underflow concentration, it is convenient, with low costs to adjust. Originally, be applicable to the separation operation of trades such as oil, chemical industry, coal dressing, food, sewage treatment, be particularly useful for to acquire the occasion of heterogeneous class of material of different concentration.