Jib loading boom, hoist, engineering machinery

The utility model provides a jib loading boom, hoist, engineering machinery. This jib loading boom, including the arm body and the arm point pulley portion of setting in the arm point department of the arm body, its characterized in that, the sharp pulley portion of arm includes: arm point loose pulley assembly, the sharp loose pulley assembly setting of arm is on the arm body, and arm point loose pulley assembly has the operating position of the cantilever arm body and the internal non- operating position of arm that retracts, support the driving piece, support the driving piece and be connected with arm point loose pulley assembly to the actuating arm point loose pulley assembly move between operating position NOT AND operating position. Hiding of arm point loose pulley assembly can be realized to this jib loading boom, has avoided arm point loose pulley assembly to shelter from driver's sight.