The invention provides a selection and screenshot system in a network video system. The selection and screenshot system includes successively connected screenshot unit, distribution unit, execution unit and storage unit, and a task management acquisition and classification unit, wherein a determination unit is disposed between the execution unit and the storage unit, and an output end of the determination unit is externally connected with a feedback unit, and the output end of the feedback unit is connected to the screenshot unit and the execution unit; and the task management acquisition andclassification unit is connected with the screenshot unit and the execution unit, and is externally connected to an information end. The selection and screenshot system in the network video system andthe control method thereof can allocate each intercepting scheme and screenshot device in the order of priority, and execute the loop until the screenshot is successful, and the structure is simple,and the selection and screenshot system is easy to manufacture, install and run.