NOVELTY - Producing non-refined oil for biodiesel production involves selecting non-refining grease, adding catalyst A, selecting qualified methanol/catalyst A, grease, superfluous methanol pre-esterification reaction, and discharging gas phase methanol rectification entrained water vapor, after pre-esterification of oil cut acid residue, separating catalyst B and proper methanol to dissolve, where grease and catalyst B and methyl alcohol solution prepared under suitable conditions to carry out ester exchange reaction, water washing and separating to remove catalyst B, de-acidifying, dehydrating.    USE - For producing non-refined oil for biodiesel production (claimed).    ADVANTAGE - The process is stable, fully realizes recycling superfluous methanol, soft water, save, and crude glycerine is the side product energy and resource, and joint glycerine refining production line, the tower bottom heavy oil, a waste oil by-product are fully recovered, the quality is good, it does not waste raw material.    DETAILED DESCRIPTION - Producing non-refined oil for biodiesel production involves selecting the non-refining grease adding catalyst A as raw material, and the raw material a proper pre-processing, selecting the qualified methanol and catalyst A, the grease, the superfluous methanol pre-esterification reaction, and discharging the gas phase methanol rectification entrained water vapor, after the pre-esterification of oil a cut acid residue, and adjusting to the suitable temperature, at the same time, separate the catalyst B and proper methanol to dissolve, and adjusting to the proper temperature, a fourth step, the grease and catalyst B and methyl alcohol solution prepared under suitable conditions to carry out the ester exchange reaction, water washing and separating to remove the catalyst B and a switch generating the glycerine, and rectifying and recovering the residual methanol to obtain a sample A, a sample A vacuum distilling to obtain a sample B and the tower bottom heavy oil, de-acidifying the depth of a sample B, washing by water, dehydrating to obtain biodiesel product.