Provided are system and method for multi-protocol label switching (MPLS) label-switched path (LSP) protection switching in an MPLS system employing a working LSP and a protection LSP in a 1:1 mode, The system includes: an ingress node multicasting input MPLS traffic through the working LSP and the protection LSP using a fed-back BDI signal; a transit node relaying the MPLS traffic input from the ingress node, and generating a FDI signal when the failure occurs; and an egress node extracting the MPLS traffic from the MPLS LSP input from the transit node, and when the FDI signal is detected, inserting and feeding back the BDI signal to the ingress node through a return path and performing switching to the protection LSP.