With the continuous development of science and technology, the size of projectors on the market is getting smaller and smaller. The improvement of portability makes the projector market gradually enter the family, and people's demand is further improved. Many people have regarded projectors as necessities of family life. People pay attention to the viewing experience and portability. Starting from portability and experience, this design combines projector and sound modularly to realize 3D sound effect, and changes the internal structure to realize 90 degree rotation of lens.