本文基于智能手机和Matlab软件设计了一种居家环境下可实现的悬滴法水滴表面张力测量实验. 借助智能手机拍照功能获得水滴图像，利用Matlab进行边缘检测及计算，从而得出表面张力系数. 对于不同清晰度的情况提出了对应的分析和处理方法，实验结果表明该方法稳定可靠. 为后疫情时代开展居家大学物理实验教学提供了一个典型案例.

An experiment of measuring surface tension of water droplets based on pendant drop method is developed by using a smartphone and Matlab software that can be used at home. The surface tension coefficient is calculated by taking a photo of water droplets with a smartphone and then using Matlab to recognize and calculate the edges. For various clarity cases, appropriate analysis and processing methods are presented, and testing results show that the method is stable and trustworthy. It is a typical case of post-epidemic experimental teaching of university physics at home.