The invention relates to an underground mechanized continuous ore drawing beneficiation method. The method comprises the following steps: detecting mineral aggregate components of a working face ore body; carrying out region and working section division on a working surface according to grade grades; using a drum-type mining machine for mining working sections one by one from the starting end to the terminal end of a working face; carrying out regional mining one by one in each working section according to the sequence of the mineral aggregate grades from high to low; only reserving mineral aggregate at a lowest level of the top and a bottom step in each working section; returning the mining machine to the starting end from the terminal end; in the process, mining the mineral aggregate atthe lowest grade at the top and the bottom step section by section at a time, before the grade of the exploited mineral aggregate is about to be switched, controlling time-sharing conveying by a conveyor and split charging by a tail end discharging split charging machine through signal coordination, and conducting split charging on the falling mineral aggregate into different stock bins accordingto different grade grades of the mineral aggregate. According to the method, respective mining of different-quality mineral aggregates in a same working face is achieved, the mining profit is greatlyincreased, and particularly, the economical efficiency of hard and graded material mining is remarkably improved.