The utility model discloses an intelligent self-moving belt tensioning system. The intelligent self-moving belt tensioning system comprises a tensioning device, a speed acquisition device, a tension sensor and an electronic control system, wherein the tensioning device and the speed acquisition device are installed on a tension roller of a belt conveyer, the tension sensor is installed below the base of a driving roller of the belt conveyer, and a PLC serves as the core of the electronic control system. According to the intelligent self-moving belt tensioning system, the load on a conveying belt is identified by means of the proportional relation between the current and the load, a detecting signal is converted into tractive force needed by a system, the tractive force is compared with the tensile force detected by a tension sensor, a traction trolley is controlled to move forwards or backwards according to a comparison result, the tensioning of the conveying belt is controlled dynamically, tensile force necessary for the normal operation of the conveyer is provided for the conveyer, slipping is avoided, and proper and timely intelligent dynamic tensioning of the conveying belt in a long distance is achieved.