NOVELTY - Continuous production of bio-diesel, comprises: (i) filling solid alkaline catalyst with regular duct into a reactor; (ii) increasing the temperature of oil storage tank, oil pipeline pre-heater, alcohol pipeline pre-heater, static mixer and the reactor, pumping oil and low alcohol to the device, conveying into reactor and performing ester exchange reaction; (iii) conveying the reacted discharged material to the vacuum distillation unit and recovering the low alcohol; and (iv) conveying the distilled solution to a stratification device to obtain the bio-diesel product and crude glycerol.    USE - The method is useful for continuous production of bio-diesel.    ADVANTAGE - The method: utilizes catalyst having macroscopic one-dimensional straight duct that reduces the pressure drop on the catalyst bed and the requirements on the catalyst strength and device loading capacity; utilizes a low cost device; is simple and consumes less energy; and produces bio-diesel having a total yield of 98% or more.    DETAILED DESCRIPTION - Continuous production of bio-diesel comprises: (i) filling solid alkaline catalyst with regular duct into a reactor, assuring the duct to be in a parallel manner with the flowing direction of the liquid, where: the reactor is a tubular reactor, a fixed bed reactor or a trickle bed reactor, the outer diameter of the solid alkaline catalyst with regular duct is as same as the inner diameter of the reactor and the entire catalyst is filled in the reactor, the solid alkaline catalyst with regular duct is alkaline catalyst using honeycomb ceramic as carrier, and the active components are as follows: hydrotalcite or hydrotalcite-linked solid alkali loaded with alkali metals or earth metal salts; (ii) increasing the temperature of the oil storage tank, the oil pipeline pre-heater, the alcohol pipeline pre-heater, the static mixer and the reactor to the selected temperature, pumping the oil and low alcohol to the device, conveying into the reactor filled with solid alkaline catalyst with regular duct through the pre-heater and the static mixer and performing ester exchange reaction, where the low alcohol is at least one of methanol, ethanol, propanol, n-butanol or iso-butanol, the oil is animal oil, plant oil or waste oil using fatty glyceride as main component, the molar ratio of oil to low alcohol is 1:3-1:60, the operating pressure of the reactor is normal pressure to 10 MPa, the operating temperature is 35-180 degrees C, the retention time of the reactant is 0.5-60 minutes, the selected temperature of the oil storage tank is 35-60 degrees C, the selected temperature of the oil pipeline pre-heater is 35-150 degrees C and is not less than the temperature of the oil storage tank, the selected temperature of the alcohol pipeline pre-heater is 35-150 degrees C and the selected temperature of the static mixer is 35-180 degrees C and is not less than the temperature of the oil pipeline pre-heater and the alcohol pre-heater; (iii) conveying the reacted discharged material to the vacuum distillation unit and recovering the low alcohol; and (iv) conveying the distilled solution to a stratification device to obtain the bio-diesel product from the upper outlet and crude glycerol from the lower layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device for continuous production of bio-diesel.