The invention provides unbleached pulp and a preparation technology and device and application thereof, and relates to the technical field of pulping with straw. The raw material selection range of the unbleached pulp is wide, wheat straw, rice straw, reed straw and waste wood chips can be efficiently used as pulping raw materials, and thus the pulping cost is significantly reduced. According to the preparation technology of the unbleached pulp, in the aspect of softening raw materials, a new technology is adopted to replace steam heating, so that the heating cost is significantly reduced, andmeanwhile the black liquor problem in the pulping process is solved. The technological process of production is simplified, electricity and water are efficiently saved, the resource utilization rateis effectively increased, and it is guaranteed that no waste water or waste material is generated in the production process. By using the special production technology for pulping, the beating degreeis high, the quality is good, a pulping product is stable in performance and can be widely applied to functional degradable materials, and the functional applicability and material quality of the pulping product are significantly enhanced in the application fields of corrugated paper preparation, industrial packing material preparation, board preparation and tableware preparation.