A lorry-mounted crane final position self-
lying hook belongs to a hook of an
engineering mechanism. The two sides of an arm head protrusion sliding track of the self-
lying hook are connected with an arm head left
pulley and an arm head right
pulley respectively; a hook
assembly is connected at the lower end of a roller component; a hook left
pulley and a hook right pulley are connected in the hook
assembly; wire ropes are connected between the arm head left and right pulleys and the hook left and right pulleys; the arm head left pulley and the hook left pulley are arranged at an angle of 90 DEG, and the arm head right pulley and the hook right pulley are arranged at an angle of 90 DEG. The invention has the advantages that the hook
assembly is driven to overturn automatically through
wire rope hoist lift force; the hook is tightened horizontally on the lower plane of a suspension arm; the
sight of a drive is not obstructed by the hook and cables, so as to improve running safety, prevent poor effect of a
carriage deformation caused by fixing the
wire rope too tight, can guarantee certain cargo height, maximize the cargo space and have no need for manual intervention during whole hook tightening and loosening processes.