The invention relates to a sway-prevention control method for a crane, which is characterized in that according to the operation demand of the crane, an operating instruction related to a trolley is sent to a controller by an operator; the controller works out the operating speed of the trolley according to a trolley acceleration and deceleration formula; and the operating speed of the trolley iscontrolled through a frequency converter and a trolley driving motor to realize the sway-prevention control on the crane. According to the sway-prevention control method for the crane, after the crane reaches a uniform motion performed at a specified speed from a stop state, a lifting hook and a load do not sway, and after the crane reaches the stop state from the uniform motion, the lifting hookand the load do not sway as well. Moreover, the control adjustment time of the dynamic process of the crane from a static state to the uniform motion and from the uniform motion to the stop state is the shortest.