The invention discloses an electric wheelchair with a function of conveniently crossing barriers. The electric wheelchair is characterized by comprising a main wheelchair body, a first spiral liftingdevice, a second spiral lifting device, a third spiral lifting device, a first linear sliding rail combination, a second linear sliding rail combination, a first ball screw combination and a second ball screw combination, wherein the first spiral lifting device, the second spiral lifting device, the third spiral lifting device, the first linear sliding rail combination, the second linear sliding rail combination, the first ball screw combination and the second ball screw combination are arranged under the main wheelchair body; the electric wheelchair can ascend and descend steps and cross barriers through mutual cooperation among the components. The electric wheelchair has the advantages that the wheelchair can be stably and accurately lifted and lowered through the spiral lifting devices,stable sliding is achieved through the ball screw combinations and the linear sliding rail combinations, and the users who are disable in lower limbs and old people can be assisted in safely and stably ascending and descending steps and getting on or off automobiles horizontally without helping of people, and conveniently go out for social activities.