The invention provides a processing method for improving drying output of a brown coal boiler. The processing method for improving the drying output of the brown coal boiler is characterized by comprising a first step of confirming the transforming direction: reducing heat absorption capacity of a primary water-steam system and improving hot primary wind temperature, a second step of selecting the hot primary wind temperature: improving the hot primary wind temperature of the brown coal boiler to 360-380 DEG C and improving by 25-35DEG C according to conditions of the drying output needed by brown coal water, wherein an actual running value of the hot primary wind temperature is 335-345 DEG C, and a third step of transforming selection of heating surfaces: selecting a low-temperature superheater and an economizer to transform, respectively reducing 1-2 strokes of the horizontal low-temperature superheater and the economizer and respectively reducing 10-40% of areas of the two-stage heating surfaces. The processing method for improving the drying output of the brown coal boiler has the advantages of being simple in structure, easy to carry out, free of additional facilities to a machine set, convenient to operate, safe and reliable.