Tailfin-imitating propelling device

The invention discloses a tailfin-imitating propelling device. The tailfin-imitating propelling device comprises a left gear transmission part, a right gear transmission part, a middle planetary gear train part, a total input shaft, a bearing, a connecting rod, a tailfin connecting rod and a tailfin, wherein the left gear transmission part and the right gear transmission part are respectively mounted on the left and right of the middle planetary gear train part; the total input shaft penetrates a right box body, a left support box body, the bearing, a sun wheel box body and the left support box body in sequence, and is respectively mounted on the right support box body and the left support box body through the bearing; a left drive wheel and a right drive wheel are respectively connected with keys at left and right ends of a total input shaft. The tailfin-imitating propelling device enables a whole propeller to have a great bearing capability, transmit steadily, be compacter in structure and higher in space utilization rate; the adopted planetary gear train is easily integrally designed with a speed reduction device on the basis of finishing motion transformation, so that the tailfin-imitating propelling device is convenient to popularize in ship propulsion application under a high-bearing work condition.