The application discloses electric vehicle frame connecting structure which comprises a frame and a tail-bracket in detachable connection. The tail-bracket comprises a tail-bracket head tube and a tail-bracket connecting tube, the frame further comprises a control mechanism and a semi-closed connecting member, wherein the control mechanism comprises a releasing handle, a position limiting member, a tail-bracket hook and a rotating member. The control mechanism is fixed on the frame and the releasing handle is compressed and position limited by the position limiting member and the rotating member. When the tail-bracket joints with the frame, the releasing handle is lifted, the semi-closed connecting member is jointed with the tail-bracket connecting tube, and the tail-bracket hook sleeves the tail-bracket head tube, then the releasing handle is released to achieve the jointing of the tail-bracket and the frame. When the frame and the tail-bracket is separated, the releasing handle is pulled to release the tail-bracket hook from the tail-bracket head tube, and release the semi-closed connecting member from the tail-bracket connecting tube. The electric vehicle frame connecting structure is beneficial for jointing and separating of the frame and the tail-bracket, simple in operation and easy in realizing.