Underwater electric manipulator joint mechanism

The invention relates to the field of underwater robot operation, in particular to an underwater electric manipulator joint mechanism capable of covering the whole deep sea and used for marine operation and sampling, which comprises a joint fixing flange, a gear box, a gear output bearing flange and a rotary output sleeve; the joint fixing flange is connected with the gear box in a sealing way; the gear output bearing flange is arranged above the gear box in the sealing way; the outside of the gear output bearing flange is provided with the rotary output sleeve capable of rotating relatively; a gear input shaft and a gear output shaft with bevel gears are respectively arranged in the gear box, and the two bevel gears transmit with an engaged way; the gear input shaft is connected with a driving device arranged in the joint fixing flange; and the rotary output sleeve is linked with the gear output shaft. The mechanism has the advantages of compact structure, low fault rate, comprehensive functions, wide scope of application, low cost and the like.