To provide a liquefied-gas vaporization device capable of solving ice forming and frost forming problems in an air-temperature-type liquefied-gas vaporization device and operating stably and continuously.

An antifreeze heater 2 heats antifreeze liquid using air, the antifreeze liquid is supplied to a vaporization device body 1 from a water spray nozzle 6 to vaporize low-temperature liquefied-gas, and recovered antifreeze liquid is returned to the antifreeze heater 2 by a circulation pump 3 and used circularly, thereby substantially completely preventing a freeze using the vaporization device body 1 and the antifreeze heater 2. Therefore, a facility cost can be drastically reduced from the conventional facility cost by effectively using a heat transfer area, and an operation cost can be reduced thanks of substantially unnecessary auxiliary heat source. When an atmosphere release mechanism such as an open-rack-type heat exchanger is employed as the vaporization device body 1, it is disposed under nitrogen gas atmosphere, thereby preventing corrosion of the heat exchanger or the like without dissolving oxygen into the antifreeze liquid.