An automatically closing system for an electronic device includes a chipset, a control unit connected to the chipset and an eyelid detection system. The eyelid detection system detects a distance between a high eyelid and a lower eyelid. The detected distance is compared to a preset distance. The chipset receives the compare result, and sends a turning off signal to the control unit when the detected distance is smaller than the preset distance. The prevent invention further includes an automatically closing method for an electronic device.一種電子設備自動關機控制系統,包括一嵌入式控制晶片和一開關機控制單元,所述開關機控制單元連接到所述嵌入式控制晶片,所述電子設備自動關機控制系統還包括一眼瞼檢測系統,所述眼瞼檢測系統測量使用者之上下眼瞼之間之距離,將所測之距離與一預設距離進行比較,所述嵌入式控制晶片接收所述比較結果,並於所測之距離小於所述預設距離時發送一關機訊號到所述開關機控制單元;本發明還包括一種電子設備自動關機控制方法。10‧‧‧眼瞼檢測系統11‧‧‧左眼眼瞼檢測單元12‧‧‧右眼眼瞼檢測單元15‧‧‧測量模組16‧‧‧編碼模組20‧‧‧嵌入式控制晶片21‧‧‧解碼模組22‧‧‧計時模組30‧‧‧開關機控制單元
