The invention discloses a method for regulating the laser emission of a gain medium under all-optical control, which comprises the following steps of: first irradiating a carrier with random mediums by using infrared light beams with the wavelength of lambda2 or green light beams with the wavelength of lambda3; then emitting pump light (1) with the wavelength of lambda1 from a laser, converging the pump light to form stripes by using a cylindrical lens, making the stripes incident onto the carrier, arranging a detector on the bottom edge of the carrier to receive laser emitted from the carrier, and arranging a device for adjusting the energy of the pump light at the front end of the cylindrical lens; and finally prolonging the irradiation time of the red light beams (5) or improving the irradiation intensity of the red light beams (5) to improve the intensity of stimulated emitted light (7), or prolonging the irradiation time of the green light beams (6) or improving the irradiation intensity of the green light beams (6) to improve the intensity of the stimulated emitted light (7), wherein the random mediums are liquid crystal droplets which are dispersed in the azo dye-containing laser dye gain medium. The method provided by the invention ensures fixed environmental temperature, fixed electric field, simple structure and convenience of manufacturing at the same time of ensuring that a random laser can dynamically regulate stimulated emission intensity.