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For large-scale array antennas in the airspace anti-interference system, in order to reduce hardware cost and reduce calculation complexity, the entire array is generally divided into several sub-array by sub-array division technology, analog beamforming is used inside the sub-array, and digital adaptive beamforming is used between the sub-arrays; Because there are grating nulls in the beamforming pattern of uniform partition method, a non-uniform subarray partition technology based on ant colony algorithm is proposed. The maximum output signal-to-interference-noise ratio of the array is taken as the fitness function, and the path planning method combining probability calculation with roulette wheel is applied; Combining the initial concentration of pheromone and heuristic information range, a new transformation relationship between fitness function value and pheromone update is designed; Finally, the simulation results show that the proposed algorithm is superior to the uniform partition method in the output signal-to-noise ratio at different scales, different input interference-to-noise ratio and different desired signal scanning angles, and there is no grid zero, which is similar to the adaptive beamforming pattern of the whole array element and the output signal-to-interference-noise ratio, which verifies the effectiveness of the proposed method.