The invention relates to the technical field of tower crane equipment, in particular to an elongated buttress. The elongated buttress is stable and reliable in structure and can meet the long-distance requirement. The elongated buttress comprises a fixed base fixed to a wall and a tower crane connecting support connected to a tower crane. The tower crane connecting support is mounted at one end of an intermediate support. The other end of the intermediate support is connected with the fixed base through two connecting telescopic mechanisms arranged side by side and an obliquely arranged reinforcing telescopic mechanism. The connecting telescopic mechanisms and the reinforcing telescopic mechanism each comprise a guide sleeve and a guide rod with one end being sleeved with the guide sleeve. The guide sleeves and the guide rods are each provided with a row of corresponding fixing holes. Screws penetrate through the fixing holes of the guide sleeves and the fixing holes of the guide rods and then are locked through locknuts so that the guide rods can be fixed to the guide sleeves.