The invention provides a diesel-electric hybrid propulsion system and a method for statically entering a PTI, and belongs to the field of ship driving systems. The diesel-electric hybrid propulsion system comprises a two-speed gear box and a diesel-electric propulsion assembly; the diesel-electric propulsion assembly comprises two diesel engines, a generator and an electric motor; the two-speed gear box comprises two sets of gear groups, the first gear group and the second gear group are symmetrically arranged; the first gear group comprises three input and output ends, the first input and output end is connected with the first diesel engine, the second input and output end is connected with the first generator, and the third input and output end is used for connecting with a first propeller; the second gear group comprises a fourth input and output end, a fifth input and output end and a sixth input and output end, and the fourth input and output end is connected with the second diesel engine, the fifth input and output end is connected with the electric motor, and the third input and output end is used for connecting with the second propeller; and the generator can be electrically connected with the electric motor, and the generator and the electric motor can be replaced as axle generators. The energy-saving effect can be achieved.