A method for extraction of Chinese herbal medicines using small molecule micro-shear technology, comprising: pretreating 500g forsythia raw materials removed of mildew and impurity until the moisture content ≤8.0%; initially pulverizing the Chinese herbal medicinal material until it can pass through a 200 mesh sieve; pulverizing the pulverized medicinal material by a supersonic jet mill, and the gas flow pressure is between 0.1 and 0.8 MPa; adding 2-3 wt% of maltase and 1-2 wt% of 65% ethanol solution of oxalic acid to the pulverized powder, grinding them into a slurry, then filtering and recovering the slurry; treating the mixture obtained in the step by using an ultra-fine lamination ball mill for 10-15 min; putting 120 mL of propylene glycol and the materials treated by the ultra-fine lamination ball mill into the extraction kettle of the supercritical fluid extractor, and the supercritical fluid flow rate into the extraction kettle is 40 L/h, the temperature of the extraction kettle is 52°C, and the pressure is 32 MPa, the time of extraction with supercritical fluid is 7 h, wherein the supercritical fluid is supercritical carbon dioxide; taking the fluid from the extraction kettle into the middle of the separation column to separate the fluid by the first stage, and the separation column has a pressure of 12 MPa and a temperature of 65°C; taking the fluid passed through the separation column into a stirred first separation kettle to separate it by the second stage, and the first separation kettle has a pressure of 5.5 MPa and a temperature of 55°C; and taking the fluid separated by the first separation kettle enters the stirred second separation kettle, and the second separation kettle has a pressure of 5 MPa and a temperature of 45°C. pretreating 500g forsythia raw materials removed of mildew and impurity until the moisture content ≤8.0%; initially pulverizing the Chinese herbal medicinal material until it can pass through a 200 mesh sieve; pulverizing the pulverized medicinal material by a supersonic jet mill, and the gas flow pressure is between 0.1 and 0.8 MPa; adding 2-3 wt% of maltase and 1-2 wt% of 65% ethanol solution of oxalic acid to the pulverized powder, grinding them into a slurry, then filtering and recovering the slurry; treating the mixture obtained in the step by using an ultra-fine lamination ball mill for 10-15 min; putting 120 mL of propylene glycol and the materials treated by the ultra-fine lamination ball mill into the extraction kettle of the supercritical fluid extractor, and the supercritical fluid flow rate into the extraction kettle is 40 L/h, the temperature of the extraction kettle is 52°C, and the pressure is 32 MPa, the time of extraction with supercritical fluid is 7 h, wherein the supercritical fluid is supercritical carbon dioxide; taking the fluid from the extraction kettle into the middle of the separation column to separate the fluid by the first stage, and the separation column has a pressure of 12 MPa and a temperature of 65°C; taking the fluid passed through the separation column into a stirred first separation kettle to separate it by the second stage, and the first separation kettle has a pressure of 5.5 MPa and a temperature of 55°C; and taking the fluid separated by the first separation kettle enters the stirred second separation kettle, and the second separation kettle has a pressure of 5 MPa and a temperature of 45°C.