The invention discloses an MT gear shifting voice prompt device based on the overall vehicle fuel oil economy. After the current gear of a vehicle is detected, a gear shifting curve corresponding to the current gear of the vehicle and the current accelerator opening degree value of the vehicle are obtained, the gear shifting vehicle speed, corresponding to the current accelerator opening degree, on the gear shifting curve is determined, then, the current vehicle speed of the vehicle is obtained according to a vehicle speed sensor and compared with the obtained gear shifting vehicle speed, according to the comparison result, judgment is conducted by a voice prompt device composed of a single chip microcomputer and a built-in voice chip, and a voice gear shifting prompt is given. According to the MT gear shifting voice prompt device, the influence of the engine fuel oil characteristic on the gear shifting curve is considered, meanwhile, the overall vehicle transmission efficiency is calculated, and gear shifting can be controlled near the economical gear shifting point more precisely; and through voice prompt, a driver can be prompted for the gear shifting opportunity in time, fuel oil consumption is reduced, meanwhile, the driver is fatigue because of paying close attention to the vehicle speed and other instrument panels often, the fatigue can be relived, and the driving experience can be improved.