The utility model discloses a bus connecting apparatus for a measuring cabinet in power transmission field. The bus connecting apparatus comprises a pair of bus connecting devices which are installed on sidewalls of the measuring cabinet and which have the same structure. Two bus connecting devices are connected through a current transformer. Each bus connecting device comprises a connecting bus assembly installed on the inner side of the measuring cabinet and a copper busbar assembly installed on the outer side of the measuring cabinet. The connecting bus assembly comprises a silicone rubber insulation sleeve that sleeves the periphery of a connecting bus. The copper busbar assembly comprises a fixed conductive seat fixedly connected with a copper busbar through a bolt. One end of the connecting bus is extended out of the measuring cabinet and the periphery of the connecting bus is connected with the fixed conductive seat through a spring touch finger. An insulating housing sleeves the outer side of the copper busbar assembly. The other end of the connecting bus is connected with a connecting bar of the current transformer. The bus connecting apparatus is simple in structure, easy to install and uninstall, and low in cost, and can be used in power transmission of the measuring cabinet.