Compared with the traditional CCD (Charge Coupled Device) camera, sCOMS (scientific Complementary Metal Oxide Semiconductor) camera is widely used in super large sky survey equipment. Different from the traditional CCD camera, sCMOS camera adopts rolling shutter, so it is very meaningful to study its photometric accuracy. Firstly, the UCAC2 (The Second U.S. Naval Observatory CCD Astrograph Catalog) standard stars in the image were identified by matching the image captured by the sCMOS camera with the UCAC2 catalog. Then, the photometry work of these standard stars has taken and the photometric data was extracted for least square linear fitting. The corresponding system conversion cofficients were obtained and the relations between instrument magnitudes and standard magnitudes were also discussed. The differences between the converted instrument magnitude and the standard magnitude were then compared, and the corresponding root mean square error has been calculated. Finally, the calculated root mean square error was used to estimate the photometric accuracy of the sCMOS camera, and the brightness-dependent photometric error analysis of standard stars was made. The results indicate that the photometric precision is 0.15 mag for objects brighter than 14 mag under photometric conditions. Through the analysis of the measurement accuracy, it can be seen that the sCOMS camera with rolling shutter has high photometric accuracy, which basically meets the requirements of space debris survey.