The invention provides a pulping system for environment-friendly mechanical pulp and mechanical chemical pulp of non-woody crops, which comprises a cutting machine, a hammer filament duster, an impregnating washer, an I-section cracking impregnator, an II-section cracking impregnator, an I-section storage reaction bin, an II-section storage reaction bin, a high-concentration impregnating millstone mill, an III-section storage reaction bin and a pulping machine and screening, purification and concentration equipment in a subsequent process, wherein a steaming spiral conveyer, the I-section storage reaction bin, the II-section storage reaction bin and the III-section storage reaction bin are provided with steam injecting pipelines, and liquid medicine injecting pipelines are also arranged at the impregnating washer, the cracking tail end of the I-section cracking impregnator, the cracking tail end of the II-section cracking impregnator and the input position of the high-concentration impregnating millstone mill. A pulping method comprises the following steps of: preparing raw materials, performing pre-steaming spiral conveying, connecting two physical filamentation treatment sections in series, performing high-concentration disc impregnating filamentation treatment, and performing high-concentration pulping, screening, purifying and dehydrating to obtain commercial pulp. The technical scheme has the technical advantages of high yield, no pollution, low energy consumption and the like.