The invention discloses a mobile type post-weight-balance control method for a crawler crane and belongs to the field of mechanical control. The crawler crane comprises a weight balance device 3 which is arranged on a stander 1 and can slide along a cross beam 2, an arm support and a controller, wherein a displacement sensor 4 is arranged on the weight balance device 3; an angle sensor is arranged on the arm support; the controller is connected with the displacement sensor, the angle sensor and the weight balance device respectively. The control method comprises the steps of calculating weight balance positions of the weight balance device 3 on the cross beam according to the working conditions of the crawler crane when the arm support is in different angles, and constructing a relational expression between the angles of the arm support and the weight balance positions; and inputting the relational expression into the controller, and enabling the controller to control the weight balance device to be positioned at the corresponding weight balance positions according to the angles of the arm support, wherein when the angle of the arm support is unchanged, the weight balance position of the weight balance device is unchanged. According to the technical scheme, the weight balance movement can be controlled according to the angle of the arm support; when the angle of the arm support is unchanged, the weight balance position is fixed in spite of full load or no load; therefore, the working efficiency and the load capacity are greatly improved.