The invention relates to a fire extinguishing agent, in particular to a green environmental-friendly plant pretreatment device of a production plant foam type fire extinguishing agent. The to-be-solved technical problem of the green environmental-friendly plant pretreatment device is to provide the green environmental-friendly plant pretreatment device of the production plant foam type fire extinguishing agent. The green environmental-friendly plant pretreatment device of the production plant foam type fire extinguishing agent includes a feeding plate, a carding grid, a cam, a first driving wheel, a diverging and carding device, a second driving wheel, a cutting fodder chopper, a filter, washing and collection mechanism and a stirring and diverging mechanism, the carding grid is arranged on the front side of the bottom end of the feeding plate, the bottom end of the feeding plate is connected with the diverging and carding device, and the middle of the front end of the carding grid isrotatably connected with the cam. The green environmental-friendly plant pretreatment device achieves the effects of automatic carding of stacked beet stalks, efficient and stable beet stalk cutting without scattering and waste, accurate removal of impurities to obtain pure beet residues.