The utility model discloses a hazardous articles groove tank car heat preservation carriage, the heat preservation carriage inside be equipped with a plurality of disconnect -type storage tanks, the outside of storage tank is equipped with the carriage shell, carriage shell and storage tank between be equipped with the ventilation insulated zoon of thickness for 10 -15cm, the lower part of carriage head shell be equipped with the ventilation groove and connect in ventilation insulated zoon, the upper portion of railway carriage tail part shell is equipped with the air outlet to be connected in ventilation insulated zoon, is equipped with the vent between two adjacent ventilation insulated zoon, the utility model discloses when the inside high temperature of storage tank, through opening ventilation groove, air -out groove and vent, through the wind -force convection current that forms among the vapour vehicle driving process, the heat of interior is taken away in the air flow, this device simple structure, the installation and maintenance is convenient, and relative energy consumption is lower, the cost of transportation of the hazardous articles commodity circulation transport service that has significantly reduced.