The tertiary oil recovery technology in offshore oil fields faces severe reservoir conditions, such as high temperature, high salinity, and oil viscosity, while the platform space is very limited. This special working environment requires oil displacement polymers to have strong salt resistance, temperature resistance, long-term thermal stability, and rapid dissolution ability. Therefore, it is urgent to develop oil displacement polymers with good viscosity increasing and instant solubility performance. Based on the above objectives, an amphiphilic oil displacement polymer (HAP) was developed. A new type of HAP was prepared by using acrylamide (AM), acrylic acid(AA),2-acrylamide-2-methylpropanesulfonic acid (AMPS), and independently developed long-chain alkyl polyether based amphiphilic functional monomers (POM). The free radical aqueous solution polymerization was used for low-temperature initiation to prepare the HAP, and a high-performance polymer product was obtained through optimization of the synthesis process. Compared with commercially available temperature and salt resistant polyacrylamide, HAP solution exhibits outstanding temperature and salt resistance, shear resistance, and good long-term stability under simulated reservoir conditions. The core displacement experiment shows that the crude oil recovery rate of HAP polymer target fluid under simulated SZ36-1 oilfield conditions is 8.8 percentage points higher than that of commercially available temperature and salt resistant polyacrylamide with the same concentration.