A production method of an alumina multichannel ceramic membrane support belongs to the technical field of multichannel ceramic membranes. The production method of the alumina multichannel ceramic membrane support comprises the following steps: carrying out a plastic extrusion molding technology on alumina adopted as a main raw material, drying the molded material in a natural drying and microwave drying combination mode, and sintering the dried material in a shuttle kiln or a tunnel kiln. Rare earth oxide, nanometer alumina sol and a sintering aid are mixed, so the flexural strength and the acid and alkali corrosion resistance of the above obtained product are improved; introduction of an organic binder in the production process of an alumina multichannel ceramic membrane greatly reduces deformation of a green body in the extruding, drying and sintering processes and improves the yield of the product; and the nanometer alumina sol has high intergranular binding strength, so the granule morphology is kept, thereby the channels of the produced product are smooth and have small filtering resistance, and the water flux is improved by 20% or above.