Tower crane, derrick mast device and hoisting method thereof

The invention provides a tower crane, a derrick mast device and a hoisting method thereof. The derrick mast device comprises a support post (10) and a hoisting part (20) which is rotationally arranged on the support post (10), wherein a hoisting pulley (21) is suspended on one side of the hoisting part (20). According to the derrick mast device disclosed by the invention, flexible adjustment of the derrick mast device in a hoisting process can be realized, hoisting operation is more flexible and convenient, and the adaptability of the derrick mast device is enhanced.