Multi-stage gear transmission mechanism, rotating mechanism and ceiling screen

The utility model discloses a multi-stage gear transmission mechanism, a rotating mechanism and a ceiling screen. The multi-stage gear transmission mechanism comprises a worm used for being connected with a motor shaft; the power output shaft is used for outputting power; the multi-stage gear set comprises N gear sets which are sequentially connected between the worm and the power output shaft in sequence, and N is a natural number larger than or equal to 4 and smaller than or equal to 8; the transmission ratio of the multi-stage gear set is reduced in the direction from the worm to the power output shaft. Through the arrangement of the worm and the multiple gear sets, the high transmission ratio can be achieved under the small size, the rotation angle can be accurately controlled, the size is small, the weight is light, and the production difficulty and the production cost can be effectively reduced; in addition, the self-locking function can be achieved through the worm and turbine structure, and the purpos