The invention discloses a purifier screen burr grinding device. The purifier screen burr grinding device comprises a base, a machining table, a grinding table and a limit device, wherein the machining table is installed on the base and provided with three sets of through holes corresponding to sieve holes of a screen in hole diameter and position; the grinding table is of a framework structure and provided with three sets of positioning rods corresponding to the three sets of through holes; the positioning rods are inserted into the through holes of the machining table; the grinding table is provided with two grinding blocks; the two grinding blocks are connected between every two adjacent sets of positioning rods in a sliding mode; the lowest faces of the grinding blocks are flush with the tops of the positioning rods; the limit device comprises a push board and a sliding rod; the sliding rod is connected to the base in a sliding mode; the push board is connected to the sliding rod and located above the machining table. Large-area grinding is achieved through sliding of the grinding blocks, the time is saved, and the efficiency is improved. The grinding blocks can move along one plane, burrs on one plane can be removed in a ground mode, and the grinding effect is good.