The invention is a self-rotating device for cleaning fouling in the heat transfer tube. The invention includes the spiral twisted strip (1) which is equipped in the heat exchanger heat transfer tube (6) and can freely rotate inside, wherein the spiral twisted strip (1) is arranged on the hanging rack (4) by the connector (2), one end of the connector (2) is connected with the twisted strip, the other end is fixed on the hanging rack, the hanging rack (4) is arranged on the rack (5), the rack (5) is arranged on the place which has a certain distance to the nozzle (61) of the heat exchanger heat transfer tube (6). Because the invention twisted strip is installed on the place which has a certain distance to the entrance of the heat transfer tube on the hanging rack by the connector, it has little influence on the fluid resistance, and the change of the fluid flow is relatively reduced. In addition, the connector has a structure that a bearing with relative large size is fixed on the hanging rack, so the durability is greatly increased, which can meet the long time full load operation need, and can be widely applied on the common heat exchanger in which the fluid flow speed is faster than 1m/s. The invention has the advantages of reasonable design, simple structure, easy installation and is convenient and practical.