The invention relates to the technical field of straw processing, in particular to a forming method and a forming system for straw pellets. The forming system for the straw pellets comprises a straw clearing device, a straw crushing device, a straw cleaning pool, a straw filament grinding device, a straw briquetting machine and a straw drying device which are sequentially connected according to the process sequence; the straw clearing device comprises a straw inputting device, a first straw clearing frame, a second straw clearing frame, a third straw clearing frame, a straw outputting device and a moving mechanism connected with the bottom of the first straw clearing frame; the straw crushing device comprises a second straw inputting device, a second straw outputting device as well as a first cutting box, a second cutting box and a third cutting box which are sequentially arranged from top to bottom. The forming system for the straw pellets, disclosed by the invention, comprises the straw clearing device, the straw crushing device, the straw filament grinding device, the straw briquetting machine and the straw drying device, and can be used for automatically and efficiently performing briquetting processing on the straws; high-quality straw briquettes can be obtained.