The invention relates to a universal wheel comprising a circular wheel frame and waist-drum-shaped rollers. Two rows of bracket sets distributed in the axial direction of the wheel frame are arranged on the circumferential surface of the wheel frame; each bracket set comprises an even number of brackets evenly distributed along the circumferential surface of the wheel frame; the rollers are connected between every two adjacent brackets in each bracket set through bearings; the rollers of the two rows of bracket sets are arranged in staggered and complementary mode; arc-shaped protection edges which are arranged on the outer sides of the rollers in an enclosing mode are arranged between every two adjacent brackets in each bracket set; the protection edges are located on the end face of the wheel frame; and gaps are arranged between the rollers and the protection edges. The universal wheel is mounted in the rear lower portion of a wheelchair; the wheel frame is driven by a motor to move; the wheelchair can be pushed in any direction freely on the ground; the structure is reasonable, manufacturability is good, mounting is convenient, force bearing is good, no eccentric torque exists, the service life is long, operation is smooth, and no noise exists; and the protection edges enable the rollers to be good in airtightness and protect the rollers, and the situation that the rollers are rubbed, rolling accuracy is affected, and thus smoothness is affected is prevented.