The present disclosure relates to a leveling control method and system, a controller, a motor grader, and a computer storable medium, relating to the technical field of construction machinery. The leveling control method comprises: obtaining the elevation of the current position of a blade of a motor grader, the elevation of a target position, and the movement speed of the motor grader, respectively, said target position being on the ground which has a certain horizontal distance from the current position along the direction of movement of the motor grader (S110); according to the horizontal distance and the speed of movement, determining a time of movement of the blade from the current position to the target position (S120); according to the difference in elevation between the elevation of the target position and the elevation of the current position, and the movement time, determining the lifting/lowering speed of a lifting/lowering cylinder (S130); controlling the lifting/lowering cylinder according to the lifting/lowering speed, and adjusting the blade from the current position to the target position (S140). According to the present disclosure, leveling accuracy is improved.