QY40K truck crane adopts full luxury cab with large view and new orthodrome streamline operating cab, which is good looking. Adopt five-segment oval rope retractable boom with double-cylinder and two-segment jib, greatly improving the working scope of the machine. The design of the streamline boom head is in keeping with the style of the machine. The boom and jib adopt new connection method, which is convenient to dismantle and install. It is equipped with the high-power environment protection engine, improving the chassis power and the trafficability.