The invention relates to a safety running control device. The device comprises a control unit, a navigation unit and a speed detector, the control unit comprises a memory, at least one processor and at least one module, the modules are stored in the memory and configured to be executed by the processors, and the modules comprise an obtaining module, a judgement module, a calculation module and a processing module; the obtaining module is used for obtaining the limiting speed of the road ahead, the current running speed of a vehicle and the distance between the current location of the vehicle and a velometer ahead, the judgement module is used for judging whether or not the current running speed is smaller than or equal to the limiting speed, the calculation module is used for calculating time needed by the vehicle for reducing the speed according to the ratio between the distance between the current location of the vehicle and the velometer ahead and the current running speed, and theprocessing module is used for controlling the vehicle to reduce the speed in time according to the time needed by speed reduction. By means of the safety running control device, overspeed of the vehicle can be prevented.