The invention relates to a rapid food cooking device and a rapid cooking method thereof. The rapid food cooking device comprises an independent water tank(100), a check unit(200), a rapid evaporation unit(300) and a cooking unit(400). The independent water tank (100)is used for containing water for generating steam, the water, for generating the steam, in the independent water tank (100)is constantly and quantitatively supplied to the rapid evaporation unit(300), the rapid evaporation unit(300) receives the quantitative water, for generating the steam, supplied by the independent water tank(100), the water for generating the steam is rapidly heated to the boiling point in the rapid evaporation unit(300), the liquid water for generating the steam is transformed into the gaseous cooking steam, the cooking unit(400) is used for containing food needing to be cooked, the check unit(200) is arranged between the independent water tank(100) and the rapid evaporation unit(300), and the check unit(200) has an opened state for discharging water and a closed state for checking.
