In the small angle X-ray scattering (SAXS) experiment of Beijing Synchrotron Radiation Facility (BSRF), the measurement of noninsitu samples usually occupies a large proportion The experimental efficiency is low by using the traditional sample holder which carries a single sample at a time In this work, an automatic sample changing device is designed for SAXS experiment at synchrotron radiation facility It can carry ten samples at a time, and the sample movement, light alignment and exposure can be operated by wireless remote control outside the experimental hutch, which increases the experimental efficiency This paper briefly introduces the basic structure, function and application of the device