Self-focused array Airy beam has properties of high strength and large beam density, which makes it have strong inhibition for atmospheric turbulence and atmospheric scattering. Thus it can be used to receive much stronger signals on the receiver side and greatly improve the quality of atmospheric laser communication. A plurality of cubic phase masks that can produce Airy beams are orderly arranged to produce a multiphase diaphragm, which then can produce an array Airy beam with self-focusing. The simulation and experiment explain the auto-focusing process of Airy beams and the effect of spot size on its auto-focusing performance. The experimental results show that the array Airy beam, based on multiphase diaphragms, can be auto-focus, and the auto-focusing size gets larger as the spot size gets larger. Thus, by means of adjusting the spot size of each Airy beam in the array, the Airy's auto-focusing position can be controlled effectively.