Underwater self-powered power supply management device and underwater self-powered instrument

The invention relates to the technical field of ocean survey, in particular to a self-powered power supply management device of an underwater instrument. The underwater self-powered power supply management device comprises a shell, a power supply management module arranged in the shell, and a control wire which is connected with the power supply management module and used for controlling on-off ofa circuit of the power supply management module. The control wire penetrates out of the shell and makes direct contact with seawater; the power supply management module is connected with a power utilization module through a power line to control the on-off of a power supply circuit. The beneficial effects of the invention are that the device does not need additional materials and components, andachieves the automatic power supply of the circuit board after underwater instruments and equipment enter water through the characteristics of seawater. Through the special design of the power supplycircuit, the power consumpt