An underwater automatic starting device comprising at least one hollow first housing and a second housing, at least one static charge sensor, an actuation control circuit and an actuating component, wherein the first housing has at least one end An engaging portion, the second end of the second housing is provided with at least one second engaging portion for engaging the first housing and the second housing by the first engaging portion and the second engaging portion, the static charge The inductor, the actuation control circuit and the actuating component are respectively disposed between the first housing and the interior of the second housing, and the static charge sensor is coupled to the actuation control circuit to sense the first portion without contacting the water. a casing and a second casing are externally filled with water or not, and the actuation control circuit automatically controls the opening or closing of the actuating member, and the actuating member can perform a function of emitting light, sound or vibration force to form a It can be applied as a multi-purpose device for underwater automatic sensing activation.一種水下自動啟動裝置，係包括至少一中空之第一殼體及第二殼體、至少一靜電荷感應器、作動控制電路及作動元件，其中，該第一殼體一端設有至少一第一接合部，該第二殼體一端設有至少一第二接合部，以藉該第一接合部及第二接合部對應接合，使該第一殼體及第二殼體接合，該靜電荷感應器、作動控制電路及作動元件皆納置於該第一殼體內部及第二殼體內部之間，且該靜電荷感應器連結該作動控制電路，以不接觸水之方式感測該第一殼體及第二殼體外表入水或未入水之狀態，並使該作動控制電路得以自動控制該作動元件之開啟或關閉，該作動元件可作發光、聲音或振動力輸出功能，以構成一可應用作為水下自動感測啟動之多用途裝置。
