The invention belongs to the technical field of the extraction of plant secondary metabolic active components, in particular to a process for extracting total phenyl propanoid from paulownia bark of paulownia tomentosa (original variety) by adopting a supercritical CO2 fluid technology. According to the invention, the paulownia bark of the paulownia tomentosa (original variety), which is washed clean, dried in the shade and crushed to have granularity of 20 to 80 meshes, is put into an extraction kettle, CO2 fluid in a supercritical state is taken as an extraction agent, and ethanol water solution with the concentration of 40 percent to 95 percent is used as an entrainer, so as to extract the total phenyl propanoid; the total phenyl propanoid is extracted under an extraction environment that the temperature is 30 to 60 DEG C and the pressure is 20 to 60Mpa for 1 to 5 hours; then the total phenyl propanoid is decompressed, resolved and separated in a separation kettle, the ethanol water solution containing the total phenyl propanoid is collected, and an extract of the total phenyl propanoid of the paulownia bark of the paulownia tomentosa (original variety) is obtained after the ethanol water solution is decompressed, concentrated, cooled and dried. The process has the advantages of simple operation process, short period, low cost, high extraction rate, no residual solvent, andthe like, can be used in mass production, and is applied to the field of medicine, cosmetics, functional food, and the like.