Underwater releasing and recovering device at regular time

The invention discloses an underwater releasing and recovering device at regular time. The underwater releasing and recovering device at regular time comprises a box body and a computer connected with the control panel; a storage battery is arranged at the bottom in the box body; an installation plate is arranged in the middle of the box body; the upper part of the installation plate is provided with a control panel and an electromagnet; the control panel is connected with a plug through an electric cable; a cover plate is mounted at the top of the box body through a static seal ring; a moving shaft penetrates through the electromagnet; one end of the moving shaft is provided with a baffle block; the moving shaft which is positioned between the baffle block and the outer end surface of the electromagnet is provided with a spring; the head part of the moving shaft is provided with a releasing rod through a connecting pin; the releasing rod penetrates through the side wall of the box body; the outer wall surfac