The invention discloses a wet comprehensive processing method of konjak. A waste alcohol suspension solution generated by all links of wet-method processing of konjak fine powder is subjected to solid-liquid separation to obtain a solid matter, namely wet ash powder; one part of clarified waste alcohol obtained by processing and separating the ash powder returns back to a konjak fine powder processing link and the other part of clarified waste alcohol is used for extracting alkaloid in konjak peel residues; an extraction solution separated by extracting is firstly subjected to decompression and evaporation and alcohol is recycled; after the alcohol is concentrated to a certain degree, strong alcohol is added into a concentrated solution to carry out alcohol precipitation and separation; a separated solid matter returns back to a peel residue alkaloid extraction procedure; separated liquid is concentrated into an extract, thus obtaining rough alkaloid; the wet ash powder and the extracted peel residues are respectively subjected to decompression for desolvation and alcohol recycling, and then are dried to obtain dry ash powder and dry peel residues; finally, the dry ash powder and the dry peel residues are ground or crushed to prepare commercially available ash powder and peel residue powder.