A negative pressure wound therapy apparatus includes a liquid collecting box and a host. The liquid collecting box includes a casing having an inlet and an outlet. The host includes a negative pressure source, a conductive module, and an electronic control module. The negative pressure source is fluidly communicated with the outlet for generating a negative pressure in the casing, so as to suck a liquid into the casing. The conductive module penetrates into the casing. The electronic control module is electrically connected to the negative pressure source and the conductive module. When the electronic control module detects that an electric potential of the conductive module changes, the electronic control module determines that the conductive module contacts the liquid and switches off the negative pressure source at the same time.一種負壓創傷治療裝置包含集液盒及主機。集液盒包含盒體。盒體具有入口及出口。主機包含負壓源、導電模組及電控模組。負壓源與出口流體連通,用以在盒體內產生負壓,進而可將液體由入口吸入盒體內。導電模組穿入盒體。電控模組電性連接負壓源與導電模組。當電控模組偵測到導電模組的電位改變時,即判定導電模組與液體接觸,並同時關閉負壓源。1‧‧‧負壓創傷治療裝置10‧‧‧集液盒100‧‧‧盒體100b‧‧‧出口100c‧‧‧穿孔102‧‧‧卡扣結構102a‧‧‧彈性臂102b‧‧‧卡勾102c‧‧‧按壓部12‧‧‧主機120‧‧‧殼體120a‧‧‧卡槽124‧‧‧導電模組124a‧‧‧第一導電端子124b‧‧‧第二導電端子128‧‧‧吸嘴頭
