An electric kickboard comprising a self-power generating device to support a weight of a user standing up, comprising: a wheel frame to which an electrically driven wheel is mounted; a frame bracket coupled onto a deck that is coupled onto the wheel frame; a moving bar that is coupled to an upper end of the frame bracket, bent in a radial direction when an external force is applied and then restored, and comprises a spring guide vertically formed at a central portion thereof; a seat frame housing that is detachably coupled to the moving bar and hollow in a longitudinal direction thereof so that a seat bar mounting chamber is formed therein; a seat bar comprising a seat bar body and a seat bar support, wherein the seat bar body is inserted to the seat bar mounting chamber to vertically vibrate according to load variation caused by movement in the seat bar mounting chamber, and the seat bar support protrudes to the outside of the seat bar mounting chamber; a first spring inserted between the moving bar and the seat bar to elastically support the seat bar while surrounding the spring guide; a second spring inserted between the seat bar and an upper end of the spring guide to elastically support the seat bar and having a spring constant different from that of the first spring; a seat coupled to an upper end of the seat bar support; a rack moving groove formed at each of both sides of the seat frame housing; a stator body that is disposed at a central portion of the rack moving groove, coupled to each of the both sides of the seat frame housing, and comprises one pair of stators therein; a rotator rotatably installed to each of the stators to generate electricity by electromagnetic induction; a rotation shaft configured to connect the rotators with each other in an integrated manner; an one-way gear disposed between the rotation shaft and the rotator to transmit a load only when the rotation shaft rotates in a forward direction and rotate idly when the rotation shaft rotates in a reverse direction; a pinion gear disposed at a central portion of the rotation shaft; and a rack gear disposed at each of both sides of the seat bar support so as to be engaged with the pinion gear. a wheel frame to which an electrically driven wheel is mounted; a frame bracket coupled onto a deck that is coupled onto the wheel frame; a moving bar that is coupled to an upper end of the frame bracket, bent in a radial direction when an external force is applied and then restored, and comprises a spring guide vertically formed at a central portion thereof; a seat frame housing that is detachably coupled to the moving bar and hollow in a longitudinal direction thereof so that a seat bar mounting chamber is formed therein; a seat bar comprising a seat bar body and a seat bar support, wherein the seat bar body is inserted to the seat bar mounting chamber to vertically vibrate according to load variation caused by movement in the seat bar mounting chamber, and the seat bar support protrudes to the outside of the seat bar mounting chamber; a first spring inserted between the moving bar and the seat bar to elastically support the seat bar while surrounding the spring guide; a second spring inserted between the seat bar and an upper end of the spring guide to elastically support the seat bar and having a spring constant different from that of the first spring; a seat coupled to an upper end of the seat bar support; a rack moving groove formed at each of both sides of the seat frame housing; a stator body that is disposed at a central portion of the rack moving groove, coupled to each of the both sides of the seat frame housing, and comprises one pair of stators therein; a rotator rotatably installed to each of the stators to generate electricity by electromagnetic induction; a rotation shaft configured to connect the rotators with each other in an integrated manner; an one-way gear disposed between the rotation shaft and the rotator to transmit a load only when the rotation shaft rotates in a forward direction and rotate idly when the rotation shaft rotates in a reverse direction; a pinion gear disposed at a central portion of the rotation shaft; and a rack gear disposed at each of both sides of the seat bar support so as to be engaged with the pinion gear.