Abstract: A device for stabilizing mast tilting angle of a cargo equipment with a tilt-cylinder for controlling the angle of the mast; a main valve for driving said tilt-cylinder according to the operation of the driver as to the direction of the hydraulic fluid; and a plurality of solenoid valve, selectively opening fluid passages in response to electric signals, and deciding the supply direction of the hydraulic fluid to drive said tilt-cylinder. The tilt-cylinder controls the mast angle through the supply of the hydraulic fluid.