Heat insulation bottle

A heat insulation bottle, comprising:

• a bottle body comprising an accommodation chamber opened to a top side thereof, said accommodation chamber defining a concave arc portion in an inner bottom side thereof;
• a bottle head comprising a bottle mouth located at a top side thereof with an opening defined therein and a guide surface located at an opposing bottom side thereof, said guide surface sloping upwards from the bottom side of said bottle head to a bottom side of the said opening in said bottle mouth, the bottom side of said bottle head being detachably connected to the top side of said bottle body to keep the said opening in said bottle mouth in communication with said accommodation chamber, said bottle head further comprising an air vent in communication between said accommodation chamber and the outside;
• a flexible bushing mounted in the said opening in said bottle mouth;
• and
• a bottle cover connected to said bottle head and adapted for blocking the said opening in said bottle mouth.