The invention relates to an adjustable energy-saving gas stove. The lower part of a stove head is provided with an upper-lower adjustable mechanism which consists of a horizontal transmission part, a vertical lifting part; the horizontal transmission part comprises a servo motor, a lead screw, a rack, a transmission lead screw sleeve and a guide rail. A vertical transmission part comprises a fixed seat, a gear and a threaded shaft; the gear is meshed with the rack; the threaded shaft is fixedly connected with the gear; the lower end of the threaded shaft is in a floating connection with a lower bearing seat by threads; the upper end of the threaded shaft is in a floating connection with an upper bearing seat by threads; the two opposite sides of the upper bearing seat are provided with slipways; a sliding block is connected with the wall of the stove by a support; and the upper bearing seat is connected with the stove head by bolts. The burning distance between the stove head and a pan body is changed by adjusting the position of the stove head, thus furthest guaranteeing the contact between the flame and the pan body, leading heat exchange to be more full, exchange to be more effective and heat absorbed by the pan body to be more, fully utilizing gas, improving heat energy utilization ratio of gas and saving energy.