Bridge deck crane and using method thereof

The invention relates to the field of building machines and provides a bridge deck crane. The bridge deck crane comprises a crane body, the crane body comprises a walking part and a lifting appliancesupport extending out towards the front of the walking part, a lifting appliance is arranged on the lifting appliance support through a lifting rope in a lifting mode, and a walking wheel train is arranged at the bottom of the lifting appliance; an anchoring device is arranged on the walking part and used for anchoring the walking part to a steel bridge under construction, and the longitudinal distance between the lifting center of the lifting appliance support and the walking part is larger than or equal to the sum of one half of the length of a steel beam section and the length of the lifting appliance; the walking wheel train is arranged on the lifting appliance, so that the lifting appliance can be dragged to move on the steel bridge under construction, the lifting appliance does not need to be suspended on th