The invention discloses an electromagnetic excitation energy converter, a laser projection optical sound screen, and a synchronous display method thereof, and relates to the technical field of the image display and the acoustics. A hard or flexible laser projection optical screen is used as display and sound production of a sound production component, the electromagnetic excitation energy converter is used for pushing the screen or an auxiliary sound production board to vibrate the same, thereby forming an acoustic output; a low pitch enhancing unit, a middle pitch enhancing unit and high pitch enhancing unit are further provided, and the graceful tone quality capable of covering the full frequency bands can be played through the processing of a power amplifier and a frequency divider; andthe sound-picture synchronization technology can be achieved through a specific algorithm and software processing. Through the scheme disclosed by the invention, the vibration amplitude of the screencan be controlled to be imperceptible by the human eye while the screen is vibrated to excite the sound production, thereby guaranteeing that the display picture cannot be interfered, and a laser projection optical sound screen system scheme capable of displaying excellent picture and playing the beautiful sound is formed, the problem that the traditional box type sound group is large in volume,inconvenient for use, and separated in picture display and sound is solved, and the audio visual experience demand of the user is satisfied.