A method for controlling isocandela multi-laser beam based on an optical phased array belongs to the technical field of diffraction optics, and mainly relates to a method for converting a laser beam into multi-laser beam with symmetrical distribution, equal light intensity and controllable direction by the optical phased array. A single-dimensional isosceles triangle phase grating is formed on an optical phased array device to make the laser beam which is carried out normal incidence on the optical phased array device divided into two groups of beams after the emergence of the laser beam, and the two groups of the beams are deflected symmetrically; a two-dimensional phase grating is formed on the optical phased array device to make the laser beam with the normal incidence divided into four groups of the beams in a two-dimensional space, and the four groups of the beams are deflected symmetrically; and the height phi h of the isosceles triangle phase grating can be finely adjusted in a feedback mode. The method can form and deflect the multi-laser beam with small beamwidth, is easy to realize the feedback control of the light intensity, and can be used for scanning and tracking of the multi-laser beam, such as the fields of laser communication, laser radar, optical tweezers, and the like.