The invention relates to a scraper calibration method. The method includes the steps that (1) the actual distance value from a plurality of to-be-detected points connected into a straight line in a covered area of the powder laying face in the scraper moving process to a preset detection face is detected and obtained; and (2) whether a scraper is damaged or abraded or not is judged according to the actual distance value from the multiple to-be-detected points on the powder laying face to the preset detection face as well as a preset theoretical distance value from the multiple to-be-detected points on the powder laying face to the preset detection face, and the preset detection face is a plane parallel to the powder laying face. Compared with manual observation detection, whether the scraper is damaged or abraded or not or whether the scraper is kept horizontal or not can be discovered in time according to the difference of the actual distance value between the preset detection face and the multiple to-be-detected points on the powder laying face together with the preset theoretical distance value, the detection accuracy is high, and thus printing quality is guaranteed. The invention further provides three-dimensional body manufacturing equipment and a powder laying device thereof.