PM2.5　emission　causes　serious　harm　to　health　and　hinders　the　sustainable　development　of　economy　and　society.　Among　all　the　factors　affecting　PM2.5　pollution,　the　role　of　new　economic　forms　and　information　technology　innovation　is　lacking.　This　study　aims　to　explore　the　impact　of　digital　economy　on　PM2.5　pollution　and　its　influencing　mechanism　using　data　from　281　prefecture-level　cities　from　2011　to　2016.　The　empirical　results　demonstrate　that　digital　economy　is　conducive　to　reducing　PM2.5　pollution.　In　other　words,　the　digital　economy　is　conducive　to　alleviating　PM2.5　pollution.　Further　analysis　shows　that　the　digital　economy　promotes　technological　innovation,　which　is　an　important　mediating　mechanism　affecting　PM2.5　pollution.　Additionally,　the　inhibitory　effect　of　digital　economy　on　PM2.5　pollution　is　more　significant　in　the　eastern　and　central　regions.　Unfortunately,　the　negative　impact　of　digital　economy　on　PM2.5　pollution　is　not　significant　in　the　western　region.　The　conclusions　provide　a　new　strategy　for　reducing　pollution　emissions　and　improving　environmental　quality　and　technological　innovation.