The present invention provides a method for recovering and utilizing SAGD steam injection separation water. The method comprises: conveying high salt content water of a SAGD steam injection station to a water supply main pipeline through a high salt content water seamless pipeline; injecting a poly aluminium chloride solution to the high salt content water seamless pipeline, wherein 0.6-0.7 ton of the poly aluminium chloride solution is injected to per 1000 tons of the high salt content water; discharging the high salt content water into a buffer pool, adding a polyacrylamide solution to the buffer pool, and precipitating, wherein per 1000 tons of the high salt content water is added with 0.3-0.4 ton of the polyacrylamide solution; and diluting the precipitated liquid in clear water, and re-injecting into the steam injection boiler so as to complete the recovery and utilization of the SAGD steam injection separation water. With the method of the present invention, the high salt content water obtained through SAGD extraction can be directly recycled by the steam injection boiler without the combination station treatment.