The invention discloses a low slow small prevention and control system and method based on data chain detection and countering. The system and method are mainly used for solving the problem that whena low-altitude slow-speed small target unmanned aerial vehicle (hereinafter referred to as a'low slow small aircraft') appears in an urban complex environment, due to shielding of buildings and various buildings, radar detection equipment, visible light/infrared equipment and the like cannot effectively find and identify targets, and a laser interception mode and a net bomb capturing mode cannot play a role. According to the method and the system, a multipoint networking mode of radio monitoring is adopted; the method is specially used for detecting a data chain of a low slow small aircraft; amulti-point layout mode in a networking area is utilized to describe the navigation track of the aircraft, refined processing is carried out on a tested data chain point by point, and when the low slow small aircraft enters a forbidden airspace, the flight of the aircraft is destroyed by adopting a same-frequency suppression interference and GPS signal area spoofing manner, thereby achieving theprevention and control of the low slow small aircraft in an urban complex environment.