The invention discloses an environment-friendly and pollution-free processing method for bamboo chips for a piece-to-piece jointed mat. The method is characterized by comprising the following steps: (1) cutting a bamboo tube into bamboo chips; (2) performing boring and fine grinding on the bamboo chips on a boring and fine grinding device; (3) roasting; (4) washing with water; and (5) drying. The boring and fine grinding device comprises a frame which comprises thereon a longitudinal feeding mechanism for feeding in a bamboo chip length direction, a feeding track, a side face abrading and grinding mechanism, an auxiliary hole boring mechanism, a green surface grinding mechanism, a transverse feeding mechanism in a bamboo chip width direction, a feeding disc, and a bamboo chip end face boring and grinding mechanism. The method and the device are applicable to abrading of both side faces of the bamboo chips in the length direction, boring in the length direction, and grinding and polishing of the green surfaces and four side faces in the length and width directions of the bamboo chips. The method disclosed by the invention is feasible; the obtained products can be directly fed to the roasting step, thereby avoiding pollution caused by bamboo chip sanding and water washing steps to the environment; the device is simple in structure, convenient to maintain, low in operating cost, and easy to operate and control, and full-automatic intelligent control can be achieved.