The invention discloses a magnetic disinfection maintaining mechanism for an infusion bottle. The magnetic disinfection maintaining mechanism comprises a chassis (5), a spindle (4), an infusion bottle mounting disc (2), a magnetic attraction cap (8), a horseshoe-shaped decapping mechanism (6) and a horseshoe-shaped decapping mechanism mounting disc (7). The infusion bottle mounting disc (2) is mounted at the position, higher than the horseshoe-shaped decapping mechanism mounting disc (7), of the spindle (4) and can rotate around the spindle (4); the horseshoe-shaped decapping mechanism (6) is mounted on the horseshoe-shaped decapping mechanism mounting disc (7); disinfecting cotton is mounted in the magnetic attraction cap (8), a plurality of magnets (83) are embedded into a top round ring (82) of the magnetic attraction cap (8), and a plurality of iron block protrusions (9) are fixed to the infusion bottle mounting disc (2). When the magnetic disinfection maintaining mechanism is used for infusion, the magnetic attraction cap is attracted to the infusion bottle mounting disc; when the bottle needs to be replaced, the magnetic attraction cap can be stripped by the horseshoe-shaped decapping mechanism, and operation of a nurse is convenient by means of the whole mechanism; meanwhile, a better disinfection effect is achieved.