The invention discloses a contrarotating-roller bagasse treating device with a feeding trough and a centrifugal machine. The bagasse feeding trough is arranged above a machine body of a leaching device; three-level contrarotating rollers are arranged inside the machine body and are cylindrical, bagasse guiding grooves are formed below all the contrarotating rollers, the last-level guiding grooves are connected with a material hopper of a bagasse lifting machine, and a discharging trough of the lifting machine is connected with the centrifugal machine; a water feeding valve is arranged on the lifting machine, a filter and a liquid discharging pipe are arranged at the upper portion of the machine body, and the liquid discharging pipe is connected with a triple-effect long-pipe rising-film evaporation and concentration device; a cosine gel-tray pulse detonation gas device is arranged in the machine body, and a mechanical ultrasonic vibration exciter is arranged at the lower left corner of the machine body. According to the contrarotating-roller bagasse treating device, the three-level contrarotating rollers, the cosine gel-tray pulse detonation gas device and the mechanical ultrasonic vibration exciter have distinct characteristics, leaching and extracting of sugar can be synergistically promoted, and the contrarotating-roller bagasse treating device has the difficultly-predictable working principle and technical effect of technical staffs in the field, and has the high practical application value.