Disclosed are a control method, device and system for vehicles in Internet of Vehicles and a vehicle. The method comprises: acquiring the current speed v1 of a first vehicle, the current maximum braking capability a1 of the first vehicle, the current speed v2 of a second vehicle and the current maximum braking capability a2 of the second vehicle (S101), wherein the first vehicle is the vehicle closest to the second vehicle in front of the second vehicle; determining a current minimum safe distance S safe between the second vehicle and the first vehicle according to v1, a1, v2 and a2 (S102); and controlling the second vehicle according to the current distance S current and S safe between the first vehicle and the second vehicle (S103).
