The utility model discloses a multifunctional connector special for oil injection and drainage of a transformer. The multifunctional connector structurally comprises a main pipe. A control valve is arranged at one end of the main pipe, the other end of the main pipe is divided into a plurality of branch pipes communicated with the main pipe, and buckle type connectors are arranged at the tail ends of the branch pipes respectively. According to the multifunctional connector, the operation time for oil injection and drainage is shortened, manpower and material resource consumption is greatly reduced, and the overall work efficiency of the operation step of oil injection and drainage of the transformer is improved obviously. Thus, the multifunctional connector has the application and popularization value in the electric system maintenance department.