In　last　few　years,　with　the　rapid　development　of　robot　technology,　human-machine　interaction　technology　has　increasingly　become　the　focus　of　many　researchers.　The　security　of　human-computer　interaction　is　becoming　more　and　more　important.　As　an　important　part　of　human-machine　interaction,　robot　active　sensing　has　also　become　an　important　field　of　human-machine　interaction.　Aiming　at　the　requirement　of　active　sensing　technology　in　the　field　of　human　computer　interaction,　a　low-cost　data　acquisition　system　for　surface　pressure　sensing　is　designed　by　using　STM32　microcontroller　and　film　pressure　sensor　matrix.　The　system　architecture,　acquisition　circuit　and　high-speed　communication　circuit　are　discussed　detailly　in　this　paper.　The　experimental　results　show　that　the　system　can　collect　all　sensors＇　data　of　the　pressure　matrix,　data　acquisition　frequency　is　50Hz.　The　real-time　display　of　the　host　computer　is　realized,　and　the　network　expansion　interface　is　reserved　to　facilitate　the　expansion　of　the　system.　The　linear　fitting　method　is　used　to　correct　the　sensors,　and　the　perception　accuracy　of　the　pressure　matrix　sensors　is　improved.　The　pressure　sensing　surface　can　be　used　to　create　the　perception　of　the　floor,　the　cushion　or　desktop　perceived　perception　and　so　on.　It　is　a　useful　supplement　to　the　field　of　active　perception　in　the　field　of　human　computer　interaction.　©　2017　IEEE.