Computer host for classroom teaching

The utility model discloses a computer host, and relates to the technical field of teaching aids. The computer mainframe fixing device comprises a sliding rail laid on a classroom platform and a clamping seat used for fixing a computer mainframe. The slide rail is a U-shaped steel rail; a sliding seat is slidably connected into the sliding rail; an L-shaped plate is fixedly mounted on the upper surface of the sliding seat; an L-shaped metal plate is mounted on one side of the L-shaped plate; one end of a connecting rod is fixedly mounted on the L-shaped metal plate; connecting seats are fixedly mounted at the other ends of the connecting rods; a fixing rod is mounted in the connecting seat; clamping seats are respectively mounted at two ends of the fixing rod; and universal wheels are fixedly mounted at the bottoms of the clamping seats. The sliding rails are laid on the platform, the host can move on the sliding rails at will conveniently, meanwhile, the host is fixed to the sliding rails through rotation of