The invention relates to an adjustable electric roller skate, comprising a support (1), a power assembly, a drive assembly and a fastener (6), wherein the power assembly comprises a motor (4), a controller and a remote control; the drive assembly comprises front roller groups (2), rear roller groups (3) and a speed reducer (5); the front roller groups (2) and the rear roller groups (3) are mounted at the bottom of the support (1); the motor (4) is fixed at the bottom of the support (1); the speed reducer (5) is arranged on a connecting shaft of the front roller groups (2) or the rear roller groups (3); the output end of the motor (4) is connected with the input end of the speed reducer (5); the fastener (6) is arranged at the top of the support (1); and the fastener (6) is divided into a heel part (6.1) and a toe part (6.2). The adjustable electric roller skate has simple structure, small volume, light weight and low manufacturing and use costs and is convenient to use and carry.