The invention provides a fluid direction conversion device which comprises a body and a conversion control part. The body comprises a conversion base. The conversion base is provided with a fluid inlet hole, a fluid outlet hole, a first connection hole and a second connection hole. The first connection hole and the second connection hole are connected with an external sealing device. The conversion control part is connected with the conversion base. The conversion control part is provided with a first connection pipe, a second connection pipe and a third connection pipe. The connection positions of the three connection pipes are changed, so that the conversion control part works in different stations. In the second station, fluid flows into the second connection hole and flows out of the first connection hole, and fluid circulation in the first direction is achieved. In the third station, fluid flows into the first connection hole and flows out of the second connection hole, and fluid circulation in the second direction is achieved.