The utility model discloses a materials grinding dispersion devices is scribbled in photocatalysis, it includes agitator (1) and establishes mill (2) in agitator (1), mill (2) including be fixed in agitator (1) inner wall column shell (2.1), with column shell (2.1) are coaxial and run through pivot (2.2) of its top surface and bottom surface, the top surface of column shell (2.1) and bottom surface all evenly are equipped with the through -hole on spacing and its top surface and the bottom surface through bearing and pivot (2.2) axial, the utility model discloses the grinding efficiency is high, convenient to use.