Mechanical arm joint quick changing port capable of being replaced on track

The invention relates to a mechanical arm joint quick changing port, in particular to a mechanical arm joint quick changing port capable of being replaced on a track. The mechanical arm joint quick changing port aims at solving the problem that an existing large space mechanical arm cannot conduct maintenance on the track. The mechanical arm joint quick changing port comprises a convex body, a concave body matched with the convex body, a guiding mechanism, a positioning mechanism, an electric connector auxiliary connecting mechanism and six quick detaching and connecting mechanisms, wherein the positioning mechanism and the electric connector auxiliary connecting mechanism are installed on the concave body, the guiding mechanism is installed on the convex body, the six quick detaching and connecting mechanisms are evenly installed on the concave body, and the concave body is connected with the convex body through the six quick detaching and connecting mechanisms. The mechanical arm joint quick changing port is suitable for the aerospace field.