The embodiment of the invention relates to the technical field of machine vision, and particularly discloses a focusing method and a focusing device of projection equipment. The focusing method comprises the following steps: projecting a mark graph to a projection picture, wherein the mark graph superposes mark areas at four corners of the projection picture respectively; driving the motor to rotate for one stroke in a stepping manner, and acquiring a projection picture image after each step of rotation of the motor; screening the projection picture image with the highest definition, and calculating a motor position corresponding to the projection picture image with the highest definition; and driving the motor to rotate to the position of the motor to finish focusing, so that the problemof peripheral virtual focus of an existing focusing method is solved, meanwhile, the focusing method does not influence the main body effect of the projection picture, and the customer experience is improved.