Motor controller cooling device

The invention discloses a motor controller cooling device, and belongs to the technical field of motor controllers, the motor controller cooling device comprises a shell, a circuit board and a circulating mechanism are arranged in the shell, the circulating mechanism comprises a flange and a circulating pipe, the flange is used for installing the circulating pipe on the shell, and the circulating pipe absorbs heat in the motor controller; the transferring mechanism comprises a rotating pipe, a hole, a support and a negative pressure assembly. The support is arranged on the flange, the rotating pipe is rotationally installed on the support, and the negative pressure assembly is used for providing a negative pressure environment for the interior of the rotating pipe. By arranging a rotating pipe, a branch pipe, a first fan blade and a second fan blade, cooling liquid impacts the first fan blade and the rotating pipe to rotate, the interior of the rotating pipe is in a negative pressure environment, the rotating