A　secure　centralized　localization　based　on　mobile　beacon　for　wireless　sensor　networks　(WSNs)　was　proposed　in　order　to　solve　the　energy　limited　and　security　issue　in　localization.　The　proposed　centralized　localization　method　reduced　the　energy　consumption　of　the　unknown　nodes　by　using　a　mobile　beacon　node,　fought　against　the　attacks　behaviors　in　localization　through　the　designed　relevant　security　policy,　and　guaranteed　the　security　and　integrity　of　localization　information.　Experimental　results　show　that　the　proposed　scheme　can　improve　the　accuracy　and　stability　of　localization　for　wireless　sensors　in　un-trusted　network　environment.