A magnetic levitation system for sliding door and window, includes at least a movable module for the lower part of the sliding door and window which includes one or more permanent magnets; several fixed modules for the lower part of the frame of the sliding door and window, which includes one or more electromagnets to produce a variable repulsive magnetic field of the magnetic field of said magnets of the movable module. It has the advantage of eliminating the friction, mechanical wear and noise associated to the sliding, allowing, when deactivated, a greater air and water tightness and terminal and acoustic insulation, allowing the electromagnetic closure or locking of the door and window, increasing the security, and as is a modular system its operation and construction are simpler and more economical.