The invention relates to a device and method for sealing metal and glass. The device comprises a base (1), a working platform (2), an upright column (3), a screw rod (10), a synchronous rotating shaft (4), an upper clamp (7), a lower clamp (6), an upper coaxial positioning device (13), a lower coaxial positioning device (12), a movable positioning device (8), a heating fire head (11), an upper motor driving device (9) and a lower motor driving device (5), wherein the movable positioning device (8) moves up and down along the upright column (3) for positioning to control the upper clamp (7) which clamps a glass tube to move in a vertical direction and be positioned; the upper clamp (7) and the lower clamp (6) can synchronously and coaxially rotate; the upper coaxial positioning device (13) and the lower coaxial positioning device (12) are provided with a spring retractable device (17) and a rotating wheel (16); and the heating fire head (11) is provided with at least two spray nozzles which are annularly arranged. According to the method for sealing the metal and the glass, soften glass can be fast subjected to double-surface sealing on a metal wall surface by utilizing the gravity action of the soften glass.