The utility model discloses a safety accident investigation vehicle which comprises an equipment cabin, a lifting platform used for parking an unmanned aerial vehicle is arranged on the top face of avehicle roof of the vehicle, and a gas collector used for collecting gas data of a chemical accident site is hung on the unmanned aerial vehicle. The equipment compartment comprises an instrument storage chamber arranged at the tail of the vehicle, and the instrument storage chamber is provided with a meteorological rod used for acquiring meteorological data; and the laboratory is arranged at thevehicle body part and is adjacent to the instrument storage room, a console is arranged in the laboratory, and the console is used for controlling the unmanned aerial vehicle, acquiring gas data, receiving meteorological data and carrying out analysis processing according to the gas data and the meteorological data to obtain accident investigation information. According to the utility model, the intensity of the leakage source is calculated according to the gas data and the meteorological data, the accident damage consequence is calculated, the gas diffusion range and other accident investigation information are determined, auxiliary decision support is provided for scientifically defining the personnel evacuation range and accident emergency rescue, the emergency rescue command efficiencyis improved, and the accident loss is reduced.