The invention is suitable for the technical field of ship propulsion systems and provides a novel contra-rotating propeller ship side propulsion system. The novel contra-rotating propeller ship side propulsion system comprises a driving conical gear shaft and a contra-rotating propeller mechanism, wherein the contra-rotating propeller mechanism consists of two driven conical gears, two propeller shafts and two propellers; a driving conical gear at the lower end of the driving conical gear shaft is engaged with the two driven conical gears; and the two driven conical gears are symmetrically arranged on the two sides of the lower end of the driving conical gear shaft; the two driven conical gears are correspondingly and fixedly connected with one ends of the corresponding propeller shafts; and the other ends of the respective propeller shafts are fixedly connected with the corresponding propellers. After the novel contra-rotating propeller ship side propulsion system is mounted, the driving conical gear shafts are connected with an external power mechanism; when the driving conical gear shafts rotate, the two propellers rotate relative to each other to form a contra-rotating propeller side propulsion device; the two propellers are correspondingly used as a front propeller and a rear propeller; and the rotational kinetic energy loss of wake flow of the front propeller can be utilized by the rear propeller to be recycled so that the efficiency can be enhanced.