Siziwang Banner belongs to Ulanqab City, Inner Mongolia Autonomous Region, located in the central part of Inner Mongolia Autonomous Region, between 41°10 '~ 43°22' north latitude, 110°20 '~ 113° east longitude. According to the seventh census, Siziwang Banner had a permanent population of 129,372 as of midnight on November 1, 2020.

Siziwang Banner covers an area of 25,513 square kilometers with a population of 210,000 (as of 2008). It has jurisdiction over 5 sumu, 3 townships, 5 towns and 1 pasture. On March 4, 2020, the people's government of the autonomous region studied and agreed to withdraw from the poverty-stricken flag county sequence. In 2020, the annual GDP of Siziwang Banner reached 6.052 billion yuan.

In August 2021, Siziwang Banner was approved by the Leading Group for Rural Affairs of the CPC Central Committee as the national key Rural revitalization Banner County.