The utility model provides a T-branch pipe for mine downhole filling. The T-branch pipe for mine downhole filling comprises a main pipe and a branch pipe which is perpendicularly communicated with the main pipe. A pipe opening of the branch pipe is connected with a blind plate, a first chuck is arranged at one end of the main pipe, a second chuck is arranged at the other end of the main pipe, the pipe opening of the branch pipe is provided with a third chuck, and the blind plate is connected with the branch pipe through a hoop. The T-branch pipe for mine downhole filling is simple in structure and facilitates connection with a slurry conveying pipe. Dredging of the slurry conveying pipe under the condition that the slurry conveying pipe is not broken can be achieved by the adoption of the T-branch pipe for mine downhole filling, and the T-branch pipe for mine downhole filling is safe in operation and convenient to operate, and improves working efficiency and safe reliability of the slurry conveying pipe.