Based　on　the　semi-solid　forming　technology,　the　semi-solid　additive　manufacturing　platform　was　built　in　this　study,　and　the　forming　process　was　carried　out　with　Pb-Sn　wire　as　raw　material.　The　results　showed　that　when　z-axis　moving　distance　of　monolayer　stacking　is　4.2　mm,　extruder　head　temperature　reaches　240　°C　and　heating　plate　temperature　reaches　160　°C,　the　microstructure　is　composed　of　spherical　grains　of　Pb　solid　solution　with　average　diameter　of　13.4　μm　and　low　melting　point　Sn　phase　distributed　at　the　grain　boundary,　the　corresponding　overlap　surface　curvature　is　0.429　mm−1;　The　macro　morphology　also　showed　the　best　characteristics　with　forming　effective　degree　of　0.869　and　forming　layer　height　ratio　of　1.004.　The　mechanical　properties　of　semi-solid　additive　manufacturing　sample　with　optimized　processing　parameters　were　tested,　the　vertical　and　horizontal　tensile　strength　of　the　sample　are　44.2　and　47.8　MPa　respectively,　and　the　elongation　in　the　vertical　direction　of　sample　(29.1　%)　is　significantly　higher　than　that　(20.1　%)　in　the　horizontal　direction　because　of　double　necking　phenomena,　this　deformation　mechanical　can　be　explained　by　the　existence　of　several　bonding　areas　in　gauge　segment　and　soft　of　bonding　areas　due　to　enrich　of　Sn.　Finally,　Pb-Sn　parts　with　different　shapes　were　formed.　This　study　provides　a　basis　for　the　further　development　of　semi-solid　additive　manufacturing　for　aluminum.　©　2022