Abstract: A process of producing polylaurolactam comprising the steps of hydrolytic polymerization of laurolactam is performed in the presence of water, orthophosphoric and dicarboxylic acids at a temperature from 280.degree. to 310.degree. C under a pressure from 70 to 120 atm, leading to the formation of reaction mixture containing prepolymerizate and water, said mixture being a homophase system; removing water from said mixture by throttling said mixture down to a pressure of 0.1-0.005 atm under isothermal conditions at a flow rate of 20-90 m/sec; subsequent polymerization of the prepolymerizate accomplished in a layer at a temperature of 280.degree.-300.degree. C, which is 0.5-2.00 mm thick.The process of the invention makes it possible to obtain a high quality end product by simple technology. Running of the continuous process under said conditions allows reduction of the time of the polylaurolactam production as compared to the prior-art processes.