A wheelchair, comprising: a wheelchair body; a control system; two front wheels and two rear wheels mounted to a front part and a rear part of the wheelchair body respectively; wherein the wheelchair further comprises a left and right transmission gear used to drive the two front wheels to rotate left and right, and a front and rear transmission gear used to drive the two rear wheels to move forward and backward and assist left and right rotation, the left and right transmission gear and the front and rear transmission gear are mounted to the front part and the rear part of the wheelchair body respectively and connected to the two front wheels, the two rear wheels and the control system respectively; characterized in that the left and right transmission gear comprises a first motor, a left and right movement member connected to the first motor which is connected to the control system, and two first chains (16a,16b) mounted on spindles of the two front wheels, which are all mounted into a front end of the wheelchair body; and wherein one end of each of the two first chains (16a, 16b) is mutually connected through a first metal wire, while the other end of each of the two first chains (16a, 16b) is connected to two ends of the left and right movement member through a second metal wire; and wherein the first motor drives the left and right movement member to move left and right when it rotates, then the left and right movement member drives the two first chains (16a,16b) on spindles of the wheels to move left and right by the first metal wire and the second metal wire and the two first chains drive the two front wheels to rotate left and right. a wheelchair body; a control system; two front wheels and two rear wheels mounted to a front part and a rear part of the wheelchair body respectively; wherein the wheelchair further comprises a left and right transmission gear used to drive the two front wheels to rotate left and right, and a front and rear transmission gear used to drive the two rear wheels to move forward and backward and assist left and right rotation, the left and right transmission gear and the front and rear transmission gear are mounted to the front part and the rear part of the wheelchair body respectively and connected to the two front wheels, the two rear wheels and the control system respectively; characterized in that the left and right transmission gear comprises a first motor, a left and right movement member connected to the first motor which is connected to the control system, and two first chains (16a,16b) mounted on spindles of the two front wheels, which are all mounted into a front end of the wheelchair body; and wherein one end of each of the two first chains (16a, 16b) is mutually connected through a first metal wire, while the other end of each of the two first chains (16a, 16b) is connected to two ends of the left and right movement member through a second metal wire; and wherein the first motor drives the left and right movement member to move left and right when it rotates, then the left and right movement member drives the two first chains (16a,16b) on spindles of the wheels to move left and right by the first metal wire and the second metal wire and the two first chains drive the two front wheels to rotate left and right.