For the Liaohe oilfield steam injection hot recovery sewage silica sludge output silica sludge is difficult to deal with, and thick oil injection steam development of the latter part of the formation shortfall, inter-well vapor flurry and other issues, waste silica sludge as raw materials through granulation and sintering treatment to produce a temperature-resistant high-strength silica sludge ceramsite, and polymer solution formulated into silica sludge ceramsite plugging agent. The effects of silica sludge component content and sintering temperature on the compressive strength and apparent density of silica sludge ceramsite grains were investigated through one-factor experiments, and the hydrothermal stability, suspension and blocking properties of the plugging agent were evaluated. The results showed that the compressive strength of silica sludge ceramsite was >14 MPa and the temperature resistance was 350℃ under the conditions of 60% silica sludge doping and 1180℃ sintering temperature. Corresponding plugging agent polymer settlement rate ≤ 0.0075 m/min, high temperature plugging rate > 82%, can meet the Liaohe oil field thick oil hot oil recovery reservoir for plugging and sealing tampering and filling the formation deficit performance requirements. At the same time, the silica sludge produced by the silica removal from the extracted wastewater can be used to prepare ceramsite and reinjected back into the oilfield, which can reduce the emission of silica sludge pollutants in the oilfield.