Building construction tower crane

The utility model discloses a tower crane for building construction. The tower crane comprises a tower body and a moving unit, a tower top is arranged at the upper end of the tower body, a balance arm is arranged at the left end of the tower top, a balancing weight is arranged at the left end of the balance arm, a cargo boom is arranged at the right end of the tower top, racks are symmetrically arranged on the lower surface of the cargo boom, and a control chamber is arranged on the front side face of the tower top; the moving unit is slidably connected to the lower end of the cargo boom and meshed with the racks, a winch is arranged at the lower end in the moving unit, and a lifting hook is arranged at the lower end of a steel wire rope of the winch; wherein the device further comprises a PLC, the PLC is arranged at the left end of the interior of the control chamber, the input end of the winch is electrically connected with the output end of the PLC, the input end of the PLC is electrically connected with a