The invention discloses a device and method for utilizing a microlens array for outputting multi-beam pulse laser. The device is sequentially provided with a semiconductor laser pump source, an aspherical lens, the microlens array, a laser front endoscope, a laser crystal, an adjusting module Q and a laser output lens in the beam transmitting direction. The laser front endoscope and the laser output lens form a resonant cavity of a laser oscillator. Laser transmitted by the semiconductor laser pump source enters the laser crystal after being collimated, split and focused through the aspherical lens and the microlens array. The laser crystal absorbs pump energy. Oscillation laser is generated between the laser front endoscope and the laser output lens. The laser is modulated into a pulse form through the adjusting module Q and output out of the resonant cavity through the laser output lens. The microlens array is utilized for outputting N*M beams of multi-beam pulse laser, and the method is used for increasing the success probability of engine ignition and improving reliability.