1. A projection method, comprising: obtaining a first image, and obtaining an adjustment instruction, wherein the first image corresponds to first content; dividing the first image to a preset number of sub-images, the preset number being equal to a number of planes contained in the intersected planes, wherein dividing the first image to the preset number of sub-images comprises: determining an imaging proportion of the first image on each of the intersected planes, comprising: dividing a projection image of the first image to image areas on respective planes of the intersected planes, according to an edge of the first image intersected with the intersection line of the intersected planes; calculating image areas on respective planes of the intersected planes; and calculating the imaging proportion of the first image on each of the intersected planes, according to a proportion of the image areas on the respective planes of the intersected planes and a total area of the projection image of the first image; and dividing the first image to the preset number of sub-images, according to the imaging proportion of the first image on each of the intersected planes; determining a relative distance between the projector and each of the intersected planes, and setting the corresponding calibration matrix for each of the intersected planes, according to the relative distance between the projector and each of the intersected planes; determining a plane of the intersected planes corresponding to each of the sub-images of the first image, and using the calibration matrix corresponding to each of the intersected planes as a calibration matrix corresponding to the sub-image projected onto the plane; determining the calibration matrix preset for each of the sub-images of the first image, and calibrating each of the sub-images of the first image according to the calibration matrix corresponding to each of the sub-images of the first image, so as to obtain the calibrated sub-images as the second image, the second image comprising a target image corresponding to the first content; and projecting the second image; wherein when the second image is projected onto intersected planes formed by at least two planes, if an edge of the target image is intersected with an intersection line of the intersected planes, the edge of the target image is or is approximately perpendicular to the intersection line of the intersection planes.