Tool　wear　is　a　major　cause　of　accelerated　tool　failure　during　the　milling　of　aluminum　alloy.　The　periodically　cutting　force　directly　affect　the　cutting　heat　and　tool　wear　due　to　the　intermittent　cutting　characteristics　of　the　milling　process.　The　focus　of　this　paper　is　to　analyze　the　influence　of　the　variation　of　cutting　force　on　tool　wear　behavior.　The　change　law　of　cutting　force　by　cutting　parameters　was　analyzed　firstly.　Secondly,　the　variation　of　the　wear　land　width　(VB)　of　tool　flank　face　by　the　milling　length　was　analyzed.　Thirdly,　the　wear　morphology　and　the　energy　dispersive　spec-trometer　(EDS)　results　of　tool　rake　face　and　flank　face　in　different　cutting　parameters　were　observed　by　tungsten　filament　scanning　electron　microscope.　Finally,　considering　the　cutting　force　effect,　the　tool　wear　mechanism　during　high-speed　milling　of　Aluminum-Alloy　Die　Castings　12　(ADC12,　12　means　aluminum　number　12)　was　analyzed.　The　cutting　force　in　tangential　direction　is　predominant　during　high-speed　milling　aluminum　alloy,　which　decreases　gradually　with　the　increase　of　cutting　speed　but　increases　gradually　with　the　feed　rising.　The　adhesion-oxidation　wear　was　main　wear　mechanism　of　tool　rake　face　during　high-speed　milling.　While　adhesive　wear　was　the　main　wear　mechanism　of　the　tool　flank　face　during　high-speed　milling.　It　is　found　that　the　formation　of　adhesive　wear　is　the　process　from　particle　adhesion　to　melting　until　the　formation　of　adhesive　layer,　which　related　to　the　change　of　cutting　force.　©　2021　by　the　authors.　Licensee　MDPI,　Basel,　Switzerland.