The invention discloses a method for enhancing the brightness of a laser scanning projected image, which is characterized in that: at least two laser diodes of the same wavelength are used as light sources; laser beams are changed to be arranged in a geometric figure; the laser beams in the arrangement are reflected by an X-direction scanning vibrating mirror and a Y-direction scanning vibrating mirror onto a screen; the arrangement in the geometric figure makes the light intensity of the light spots formed by the laser beams distributed in a superposed manner; and thus, the brightness of the projected image is enhanced. Different from the conventional power increasing mode of polarized beam combining and wavelength beam combining, the method adopts specific combination and arrangement of the plurality of laser beams of the same wavelength, thereby increasing laser power and producing high-brightness and uniform lines when the vibrating mirrors scan the specifically arranged light spots.