The invention provides an aluminum-alloy crankshaft connecting rod die-casting production line, which comprises a die-casting machine, a spraying device, a melting and holding furnace and a manipulator, wherein the spraying device comprises a lifting device, a control cabinet and a spraying mechanism; the spraying mechanism comprises a shunt box connected below the lifting device, a plurality of spray heads arranged on the shunt box, transferring devices connected to outlets of the spray heads, and metal capillaries connected onto the transferring devices; the melting and holding furnace comprises a furnace body and a degassing system; a melting area, a holding area and a water intaking area are arranged in the furnace body; the holding area and the water intaking area are separated through a ceramic filtering plate; the degassing system comprises a transferring chamber, an inert gas source, a rotary shaft connected to an outlet of the transferring chamber, a rotor connected to the tail end of the rotary shaft and stretching into the holding area, and a first motor connected with the rotary shaft through a transmission structure; the manipulator is arranged between the water intaking area and a feed inlet and is used for feeding an aluminum melt into the die-casting machine. The aluminum-alloy crankshaft connecting rod die-casting production line provided by the invention solves the problems of a mold sticking phenomenon and the phenomenon that impurities are contained in the aluminum melt, and the product quality is ensured.