Totally-enclosed immersed liquid cooling device

The utility model provides a totally-enclosed immersed liquid cooling device, which comprises a totally-enclosed tank body, the inside of the totally-enclosed tank body is hollowed out, the top of thetotally-enclosed tank body is provided with an opening, a heat conductor is fixed on the opening at the top of the totally-enclosed tank body, the lower part of the heat conductor is connected with acondenser, and the condenser is connected with a condenser. The upper portion of the heat conductor is connected with a heat dissipation device, an operation main board is fixed to the bottom of thefully-closed groove body, cooling liquid is contained in the fully-closed groove body, and the cooling liquid submerges the operation main board. A power supply connector is arranged on the totally-enclosed groove body and is respectively connected with the operation main board and an external power supply; and the arrangement height of the power connector is higher than the height of the top surface of the cooling liquid.