Submarine cable cabin entering device and maintenance connector box for submarine cable

The utility model provides a submarine cable in-cabin device and a maintenance connector box for submarine cables. The submarine cable cabin entering device comprises an armored shell which is connected with a mechanical cabin body of a submarine cable to be installed, and the armored shell defines an installation through hole for the submarine cable to penetrate out and a first opening and a second opening which are communicated with the installation through hole; the first end sealing assembly is located at the first opening of the armored shell, the first end sealing assembly is connected with the armored shell in a sealed mode, the first end sealing assembly comprises a sealing seat, the sealing seat is provided with an assembling through hole for a submarine cable to penetrate out, and part of the structure of the sealing seat is located in the installing through hole; the inner side end of the sealing seat is in sealing connection with a submarine cable through a first sealing ring, and the outer side e