The invention provides a coupling method of an optical fiber and a silicon optical chip, and the silicon optical chip. The method comprises the following steps of: pasting and fixing the silicon optical chip (1) on a substrate (2), wherein the end face coupling waveguide of the silicon optical chip (1) is of a cantilever beam structure and has a spot-size converter (1-1); enabling the end face of the optical fiber (4) to be aligned with and the spot-size converter (1-1) of the coupling waveguide in a coupled manner through an image system and a fine tuning frame; enabling a fixed block (5) to be close to the optical fiber (4) from the side surface and fixing the fixed block (5) on the substrate (2); pasting a cushion block (3) respectively on the input end and output end of the silicon optical chip (1) and enabling the cushion blocks to support the parts, whose coatings are not stripped, of the optical fiber (4); utilizing the fine tuning frame to precisely align the end face of the optical fiber (4) with the area of the spot-size converter (1-1); adopting ultraviolet glue (6) to fixedly paste the optical fiber (4) with the fixed block (5) and the cushion blocks (3) after that a suitable coupling interval is obtained by adjustment. According to the invention, the coupling method of the optical fiber and the silicon optical chip is simple and reliable, the process complexity is low, the universality is good and the method is suitable for batch production.