A　sensor　interface　device　is　essential　for　sensor　data　collection　of　industrial　wireless　sensor　networks　(WSN)　in　IoT　environments.　However,　the　current　connect　number,　sampling　rate,　and　signal　types　of　sensors　are　generally　restricted　by　the　device.　Meanwhile,　in　the　Internet　of　Things　(IoT)　environment,　each　sensor　connected　to　the　device　is　required　to　write　complicated　and　cumbersome　data　collection　program　code.　In　this　paper,　to　solve　these　problems,　a　new　method　is　proposed　to　design　a　reconfigurable　smart　sensor　interface　for　industrial　WSN　in　IoT　environment,　in　which　complex　programmable　logic　device　(CPLD)　is　adopted　as　the　core　controller.　Thus,　it　can　read　data　in　parallel　and　in　real　time　with　high　speed　on　multiple　different　sensor　data.　The　standard　of　IEEE1451.2　intelligent　sensor　interface　specification　is　adopted　for　this　design.　It　comprehensively　stipulates　the　smart　sensor　hardware　and　software　design　framework　and　relevant　interface　protocol　to　realize　the　intelligent　acquisition　for　common　sensors.　A　new　solution　is　provided　for　the　traditional　sensor　data　acquisitions.　The　device　is　combined　with　the　newest　CPLD　programmable　technology　and　the　standard　of　IEEE1451.2　intelligent　sensor　specification.　Performance　of　the　proposed　system　is　verified　and　good　effects　are　achieved　in　practical　application　of　IoT　to　water　environment　monitoring.