Externally-attached and internally-mounted tower crane fixing structure

The utility model provides an externally-attached and internally-installed tower crane fixing structure which comprises a tower crane and a fixing assembly which are installed in a courtyard, the tower crane comprises a plurality of tower crane base frames which can be installed in a splicing mode, and inserting grooves are symmetrically formed in the upper end faces of the tower crane base frames. Through grooves communicating with the inserting grooves are symmetrically formed in the outer wall of the tower crane base frame, inserting blocks extending into the inserting grooves are symmetrically arranged on the lower end face of the tower crane base frame, limiting grooves coincident with the through grooves are formed in the inserting blocks, and limiting bolts are detachably installed in the through grooves and the limiting grooves. The fixing assembly comprises a plurality of connecting bases symmetrically installed on the outer wall of the tower crane base frame, the symmetrically-arranged connecting ba