本文介绍一种用计算全息方法制作的纯位相信息自聚焦匹配滤波器。它在编码时取滤波函数的振幅为１，仅对位相进行编码；并通过对傅里叶谱加入二次位相因子代替傅里叶透镜，使其具有自聚焦功能。与常规的方法（光学全息法或计算全息法）所获得的匹配滤波器相比较，具有原理上更合理，滤波器的制作和匹配光路更简单，也更容易实现匹配等特点。所得到的匹配实验结果也很清晰，这与理论是完全符合的。 This paper introduces a pure phase information self-focusing matched filter made by computational holography. It takes the amplitude of the filter function as 1 when encoding, and only encodes the phase. The quadratic phase factor is added to the Fourier spectrum to replace the Fourier lens so that it has self-focusing function. Compared with the matched filter obtained by the conventional method (optical holography or computational holography), the principle is more reasonable, the filter making and matching optical paths are simpler and the matching is easier. The results of the matching experiments are also very clear, which is completely consistent with the theory.