The invention discloses a weighing system, and an anti-cheating method and device for a weighing system. The weighing system comprises a weighing terminal, at least one weighing sensor coupled to the weighing terminal, and an anti-cheating module, wherein the anti-cheating module comprises a reading sub-module for reading a weight signal from the at least one weighing sensor, a characteristic analysis sub-module for performing signal analyzing on the weight signal to extract at least one characteristic from the change trend of the weight signal, and a characteristic determining sub-module for determining whether the at least one characteristic is abnormal, and based on a determining result of whether the at least one characteristic is abnormal, determining a cheating behavior exists. According to the invention, other embodiments are also disclosed and required to be protected.