Safety thermos bottle

The invention discloses a safety thermos bottle which comprises a bottle body, a bottle cap and a handle. A safety device which is used for limiting the bottle cap is arranged at a bottle nozzle of the bottle body and comprises two guide rails, two barriers and a hollow gear, the two parallel guide rails are fixed to two sides of the bottle nozzle, the two barriers are arranged between the two guide rails, the hollow gear sleeves the bottle nozzle, the two barriers and the two guide rails form a # shape, and the hollow gear is positioned in a region enclosed by the guide rails and the barriers. Two shifting blocks capable of sliding along the two guide rails are respectively arranged on the two guide rails and are respectively connected with the two barriers, and racks which are meshed with the hollow gear are respectively arranged on opposite side walls of the two shifting blocks. The safety thermos bottle has the advantages that the two barriers can be manually pulled to move towards each other and can move