A laser light source, comprising a laser device (1), a fluorescence wheel (4), and a colour filter wheel (7), the fluorescence wheel (4) emitting fluorescent light when excited by the laser; before reaching the fluorescence wheel (4), the laser light emitted by the laser device (1) penetrates a first diffusion plate (3), said first diffusion plate (3) being fixedly arranged; after being merged andbefore being output through the colour filter wheel (7), the laser light and the fluorescent light penetrate a second diffusion plate (6), said second diffusion plate being controlled to rotate; thecoordination of the first and the second diffusion plates (3, 6) can effectively increase the spatially random phases of the laser light beam, forming many independent speckle patterns, effectively reducing the speckle effect, and improving the display quality of projected images.