In order to improve the accuracy of surface tension coefficient measurement,and to give full play to the advantages of optical interference met hod,a novel measurement based on optical interference method for liquid surface tension coefficient is proposed.An FP cav ity is formed by a single mode fiber fusion spliced with a hollow fiber,which contacts the l iquid surface.As the liquid rising into the hollow fiber by capillary phenomenon,the length of FP cavity is changed with different liquids.The surface tension coefficient measurement then can be achieved by monitoring the adjacent interference wavelength spacings.In experiment,5different liquids in the same temperatu re and distilled water in different temperatures are measured using the method of least squares linear fitting.Distilled water is heated by water bath heating method. The experimental result is similar to the theoretical value,and the er ror is less than 0.26%.The presented method is with simple manufacturing,easy operation,a nd high accuracy,so it is suitable for measurement in practice.