Centrifuger is the key equipment in treatment of harmful superfine solidoid in drilling liquid. It can separate and recycle the solidoid with the particle of bigger than 5µm and recover the density of drilling liquid so as to increase drilling speed. It is ideal drilling liquid purification equipment for drilling a deep well and a horizontal well. This equipment is mainly used to control density, viscosity of drilling liquid, minimize solidoid content in drilling liquid, clear away harmful solidoid and recover barite, and provide secondary recovery to swirler bottom in order to assure of excellent performance of drilling liquid and increase drilling speed.