The invention discloses a precipitation technology applicable to treatment of river sewage, urban sewage and industrial sewage, including that an inclined tube is substituted by filler and precipitation treatment is carried out by combining a gas kick device. If sludge floats in precipitation process, production can be continued while spoil disposal and gas kick are immediately carried out, thus overcoming the problems of high operation difficulty, high time consumption and high water consumption caused by the fact that a inclined tube precipitation tank is required to stop production and washing can be carried out only when the inclined tube precipitation tank is arranged below the inclined tube (namely 1300-1500mm below water surface), reducing water discharge time and improving precipitation treatment effect and treatment capacity of utilization rate of facilities.