A low noise block down-converter with integrated feed (LNBF) capable of being quickly assembled is disclosed, which includes an LNBF main body, a connection portion including at least one LNBF locating hole, a support arm including at least one support arm locating hole, a holder disposed on the support arm including a first holding hole and a second holding hole, an auxiliary shaft including at least one locating protrusion, a spring including a spring body, a first spring arm, a second spring arm, and a pivot for connecting the auxiliary shaft and the spring to the holder, wherein the at least one locating protrusion passes the at least one support arm locating hole and the at least one LNBF locating hole to fix relative position between connection portion and the support arm, and the spring positions the at least one locating protrusion in an engaging state with elastic restoring force.