The　environmentally　friendly　harvesting　of　wind　energy　is　an　effective　technique　for　achieving　carbon　neutrality　and　a　green　economy.　In　this　work,　a　core-shell　triboelectric　nanogenerator　(CS-TENG)　for　harvesting　wind　energy　is　demonstrated　and　the　device　structure　parameters　are　optimized.　The　core-shell　structure　enables　the　CS-TENG　to　respond　sensitively　to　wind　from　any　direction　and　generate　electrical　output　on　the　basis　of　the　vertical　contact-separation　mode.　A　single　device　can　generate　a　maximum　power　density　of　0.14　W/m(3)　and　can　power　124　light-emitting　diodes.　In　addition,　wind　energy　can　be　harvested　even　at　a　wind　speed　as　low　as　2.3　m/s　by　paralleling　CS-TENGs　of　different　sizes.　Finally,　a　self-powered　water　quality　testing　system　that　uses　the　CS-TENG　as　its　power　supply　is　built.　The　CS-TENG　exhibits　the　advantages　of　a　simple　structure,　environmentally　friendly　materials,　low　cost,　and　simple　fabrication　process.　These　features　are　of　considerable　significance　for　the　development　of　green　energy　harvesting　devices.