Embodiments of the present disclosure provide a danger warning method for a vehicle, a danger warning device for a vehicle, and medium. The method includes: receiving a plurality of sensing data sets from a plurality of environmental monitoring devices that monitor a plurality of geographical ranges; determining a danger degree of respective object in the plurality of geographical ranges with respect to the vehicle based on the plurality of sensing data sets; and providing a danger warning instruction to the vehicle in response to determining that the danger degree is greater than a degree threshold. Each of the plurality of sensing data sets includes relevant information about objects in the corresponding geographical range, and the plurality of environmental monitoring devices are arranged away from the vehicle. The danger degree is configured to indicate a possibility that the object will endanger safe driving of the vehicle.