In　order　to　research　the　acoustic　emission　characteristics　of　polypropylene　fiber-reinforced　recycled　aggregate　concrete　under　uniaxial　load,　20　groups　of　test　specimens　with　a　coarse　aggregate　substitution　rate　of　25　%　and　50　%　are　designed　and　fabricated　to　conduct　the　acoustic　emission　test　under　uniaxial　compression,　and　the　evolution　laws　of　the　acoustic　emission　b-　value,　the　cracking　modes　and　the　acoustic　emission　RA-AF　moving　averages　with　time　are　studied.　The　laws　of　influence　of　the　coarse　aggregate　substitution　rate　and　coarse-fine　polypropylene　fiber　on　the　acoustic　emission　b-　value　of　RAC　are　discussed.　The　K-　means　clustering　method　is　adopted　for　two-dimensional　clustering　analysis　of　the　shear　cracking　and　tensile　cracking,　and　then　the　SVM　is　used　to　obtain　the　boundary　between　the　two　types　of　clusters.　The　time　distribution　laws　of　shear　cracking　and　tensile　cracking　of　the　polypropylene　fiber-reinforced　recycled　aggregate　concrete　are　analyzed.　The　changes　in　the　moving　averages　of　RA　and　AF　of　RAC　test　specimens　with　time　are　studied,　and　the　research　indicates　that　as　the　RA　value　decreases,　the　shear　cracking　gradually　reduces　and　the　tensile　cracking　gradually　increases　and　dominates.