The invention discloses a flotation machine for screening of refined ore. The flotation machine includes a machine body, a floatation box is fixedly connected to the top of the machine body through bolts, a supporting table is installed on the top of the floatation box, and the top of the supporting table is fixedly connected with a first supporting board and a second supporting board through bolts; the first supporting board is positioned on one side of the second supporting board, a second motor is fixedly connected to the outer wall of one side of the first supporting board through bolts, ahollow main shaft is in transmission connection with one end of the second motor through a belt pulley group, and a shaft sleeve sleeves the outer wall of the hollow main shaft. On the one hand, mineralized foam at different altitudes can be screened out according to demands, screening of ore different in refining degree is achieved, the applicability is improved, and meanwhile the screening precision is improved. On the other hand, the speed of discharging the mineralized foam is increased by a foam sweeping plate, the problems of repeated floatation and lower screening efficiency which arecaused by settling of the ore absorbed by the foam are avoided, and the working efficiency is improved.