In order to improve the efficiency of emulsification and viscosity reduction development of super heavy oil reservoirs，the functional monomer N-benzyl-N-alkylacrylamide（DTAM）was first prepared using acrylamide（AM），N，N-di N-methylformamide（DMF），bromoalkane and benzyl bromide as raw materials. Then the amphiphilic polymer（PBS-2）was prepared from AM，2-acrylamido-2-methylpropane sulfonate（AMPS）and DTAM. The structure of the polymer was characterized using infrared spectroscopy，nuclear magnetic resonance spectroscopy，and elemental analysis. The synthesis condition of PBS-2 was optimized using the viscosity reduction rate of synthesized product as an evaluation indicator. The interfacial activity，wetting performance，and emulsification and viscosity reduction performance of PBS-2 for heavy oil with different viscosities were evaluated. The results showed that the optimum synthesis condition for PBS-2 was obtained as follows：90∶4∶6 the molar ratio of AM，AMPS and DTAM，25% the total mass fraction of monomers，0.4% the mass fraction of initiator azodiisopropyl imidazoline hydrochloride，50 ℃ reaction temperature，and 6 hours reaction time. The interfacial activity of PBS-2 was strong. When its mass concentration reached 3 g/L，the oil-water interfacial tension value could be reduced to the order of 10^-2 mN/m. PBS-2 had good wetting performance. When the mass concentration of PBS-2 solution increased from 0 to 5 g/L，the contact angle between it and heavy oil decreased from 113.2° to 32.9°. The wettability of the heavy oil surface changed from lipophilic to hydrophilic. PBS-2 had a good emulsification and viscosity reduction effect on super heavy oil. When the mass concentration of PBS-2 was 3 g/L，the viscosity reduction rate of super heavy oil samples with viscosity ranging from 10.5 Pa·s to 112.5 Pa·s could reach over 99%. The synthesized amphiphilic polymer PBS-2 could effectively emulsify and peel off heavy oil，improve the flowability of heavy oil， meet the needs of emulsification and viscosity reduction of super heavy oil，and then provide reference for the development of chemical viscosity reduction in super heavy oil reservoirs.