With the development of technology and the popularization of communication tools, the phenomenon of cheating in exams is becoming increasingly serious, which has brought serious negative impacts on education and social security. In order to effectively prevent and combat cheating in exams, ensure that candidates truly reflect their knowledge level, and ensure educational fairness and social stability, a professional signal jammer is indispensable. Signal jammer is a device that uses advanced wireless technology to accurately block and interfere with all wireless signals in the examination hall. It can seamlessly block and interfere with communication signals from the three major operators in the 2G-5G frequency band, WIFI, Bluetooth, walkie talkies, etc., making cheating tools such as handheld devices, wireless headphones, and radios ineffective in the examination hall. At the same time, the machine also has remote monitoring and management functions, which can achieve switch control, status query, fault alarm and other operations of the equipment through the network, ensuring the reliability and stability of the shield. The signal jammer achieves precise shielding of controlled areas through multi-point low-power coverage, avoiding problems such as strong radiation and non controlled area interference caused by high-power rough shielding. Dynamically adjust according to changes in the surrounding electromagnetic environment and operator network parameters to ensure the continuity of shielding effect. In addition, it also has the ability to upgrade redundant design, meeting the shielding requirements for future new frequency band signals without changing existing usage.