Crane boom

The utility model relates to a hoisting machinery technical field especially relates to a crane boom. The utility model discloses a crane boom, include: chassis, sliding stand, cantilever crane support, a cantilever crane section of thick bamboo, telescopic boom, cylinder support, cylinder, telescopic link, engaging lug, retractor, connecting cylinder, gyro wheel, fixed column, spacing, referencecolumn and pulley, cantilever crane section of thick bamboo one end is rotated with the top of cantilever crane support and is connected, telescopic boom's one end is located the inside of a cantilever crane section of thick bamboo, the cylinder support sets up on the chassis, the one end of cylinder is rotated with the cylinder support and is connected, the telescopic link is connected with the output of cylinder, the engaging lug sets up in the telescopic boom bottom, the telescopic link rotates with the engaging lug to be connected, retractor sets up in one side of cantilever crane support,connecting cylinder and t