Disclosed is a method for controlling a construction vehicle that moderates or completely eliminates from a state, in which a bucket in a dump position is forcibly moved to a tilt position and a hydraulic bucket cylinder is pressurized when lifting a boom, impact that is generated when the bucket is operated in a tilt position, and which ensures the adequate operability and workability of boom raising operations. Also disclosed is a control device. When a construction machine is working in an operating region near to the operating region in which the bucket is forcibly moved into a tilt position or is working with the bucket in a tilt position in the operating region in which a bucket is forcibly moved into a tilt position as a result of lifting the boom with the bucket in a neutral position or a dump position, the supply of pressure oil to the hydraulic bucket cylinder is controlled so that the hydraulic bucket cylinder operates in a tilt position. Additionally, when the machine is working in an operating region near to the operating region in which the bucket is forcibly moved into a tilt position as a result of operating the boom in a neutral position or lowering the boom with the bucket in a dump position, the supply of pressure oil to the hydraulic bucket cylinder is controlled so that the operating speed of the hydraulic bucket cylinder in the dump position is limited.