NOVELTY - An integrated production process for biodiesel comprises esterification and/or ester exchange reaction; the reaction is finished in a continuous reaction system involving: (1) adding propagation fur oil or refined oil with high acidity and methanol into reaction system; adding propagation oil and methanol; (2) filling the nanometer solid heteropoly acid and/or heteropoly base catalyst; (3) adding methanol; controlling the reaction temperature; (4) adding catalyst; (5) controlling the pressure in the reaction tower; and (6) isolating glycerol.    USE - The integrated production process is used for biodiesel (claimed).    DETAILED DESCRIPTION - An integrated production process for biodiesel comprises esterification and/or ester exchange reaction; the reaction is finished in a continuous reaction system involving: (1) adding propagation fur oil or refined oil with high acidity and methanol into reaction system; where the system is an independent working unit comprising condensation section, reaction section and isolation section; the whole reaction system is made by connecting the working units by pipeline, pump and valve; in condensation section, reaction section and isolation section are respectively made of condenser, reaction tower and isolation tower; adding propagation oil from upper part of the reaction tower; adding methanol from upper part of the isolation tower; (2) filling the nanometer solid heteropoly acid and/or heteropoly base catalyst with grain diameter being 25-50 nm into the reaction tower of the reaction system; the amount of the catalyst is 1-6% of the weight of propagation oil; mole ratio of alcohol and oil is 6-48:1; (3) adding methanol with amount being 5-8 times of that of the propagation oil so that the methanol steam can be contacted with the propagation oil by reverse current; controlling the reaction temperature to be over the boiling point of methanol; keeping the temperature of the isolation tower and reaction tower at 65-95 degrees C for 2-10 hours; (4) adding catalyst with amount being 2/3 of the height of the reaction tower main body; (5) controlling the pressure in the reaction tower to approximately 25-45 mmHg higher than the high atmospheric pressure; and (6) isolating glycerol so that the prepared biodiesel is neutral. An INDEPENDENT CLAIM is an isolated plant for the integrated production process of biodiesel comprising a system for finishing the esterification and/or ester exchange reaction for the biodiesel. The system comprises raw oil tank (A), methanol tank (B), biodiesel tank (C), glycerol tank (13-16) and four parallel working units. Working comprises independent condensation section, reaction section and isolation section. The whole reaction system is made by connecting the working units by pipeline, pump and valve. Condensation section, reaction section and isolation section are made of condenser (1-4), reaction tower (5-8) and isolation tower (9-12). Condenser, reaction tower and isolation tower are vertically arranged from the top down.