Tower head of building tower crane is space truss structure group welded with angle steels. Its bottom connected to rotary tower body and its top is designed with hinge supports, hinged respectively with crane boom pull rod and balance arm pull rod. There is a platform on the upper part of tower cap and installation personnel can install and disassembly tower body and reeve lifting wire ropes on this platform. On the top of tower there is an anemometer sensor installed.