Ambient vaporizer takes natural convection in the atmospheric environment as heat source, extrude into star finned tube through the thermal conductive aluminum product for heat transfer with cryogenic liquid and vaporize gases with certain temperature, which is an efficient energy saving heat exchange equipment, mainly used in liquefied natural gas(LNG), Liquid oxygen(LOX), liquid nitrogen(LIN), Liquid argon(LAR), liquid carbon dioxide(LCO2), liquefied petroleum gas(LPG), and other low temperature media.