The utility model discloses a reminder system is prevented losing by instrument, include: prevent losing the suggestion device for be connected with fixed may the dismantlement of instrument, including the motion sensor that is used for the motion of detection instrument, detect the bee calling organ of instrument motion sound production when static and open and close bee calling organ's magnetic sensor at motion sensor, and bracelet for wear on the arm of the instrument of gripping, wherein, be provided with the at least magnetic path with magnetic sensor matched with on the bracelet, according to the utility model discloses a reminder system is prevented losing by instrument, throwing out without care after utilizing motion sensor to the tool using promptly in a confused state of mind puts that the state detects and carry out vocal tips, utilizes the cooperation of magnetic sensor and bracelet simultaneously, has solved and has thrown out chaos vocal tips when putting behind the tool using without care, has need not vocal tips and can the problem of people for removing behind vocal tips when in time taking in during at the tool using and behind the tool using.