The invention relates to the technical field of steam generator repair and maintenance, in particular to a double-shaft swinging speed reducer suitable for sludge washing equipment, and aims at solving the problem that an existing mechanical cleaning device is poor in cleaning effect. The double-shaft swinging speed reducer is characterized by comprising a speed reducer cover plate, first bearings, a first crank shaft, a crank connecting rod, a speed reducer shell body, second bearings, a second crank shaft, a shifter lever shaft, a third crank shaft, third bearings and fourth bearings. The relative position between the first crank shaft which serves as an input shaft and the second crank shaft and the third crank shaft which serve as output shafts as well as the relative position between the second crank shaft and the third crank shaft which serve as the output shafts can be easily adjusted only by changing the length of the single connecting rod, and thus the relative position between the input shaft and the two output shafts is easily arranged according to the design requirements. The transmission clearance is small, the overall structure arrangement is compact, and structural design is conveniently conducted inside a narrow space. The overall structure is simple, and the repeated precision of the position and the mechanical efficiency are high.