The invention relates to a wide-narrow row sugarcane banking machine with fine-tunable ridge surface shaping devices, and belongs to the technical field of agricultural machinery. The wide-narrow row sugarcane banking machine has a plurality of fine-tunable ridge surface shaping devices, wherein the ridge surface shaping devices are arranged on a rack of the banking machine at intervals. Each ridge surface shaping device includes a motor arranged on the rack, a horizontally-arranged screw rod, a sleeve, an I-shaped frame, a spring pull rod and a shaping wheel. Transmission gear sets are arranged on an output shaft of the motor and one end of the screw rod, screw threads engaged with the screw rod are arranged inside the sleeve, the upper portion of the I-shaped frame is connected with the sleeve in a hinged mode, the middle portion of the I-shaped frame is arranged on the rack through the spring pull rod, the shaping wheel is arranged at the lower portion of the I-shaped frame, sensors are arranged at the two sides of a frame body of the I-shaped frame and are used for detecting and measuring the distance between two sugarcane rows, and the motor is used for receiving the signal from the sensors and driving the I-shaped frame to move left and right through the screw rod. The fine-tunable ridge surface shaping devices can be used for conducting effective compaction on cultivation soils of sugarcane planted in narrow rows and wide rows alternately.