The invention relates to a detection method for the position of a blank material, belonging to the field of mechanical manufacture. The method comprises the following steps: arranging a laser generator at one side of a blank material spraying box, and arranging a laser receiving screen at a position opposite to the laser generator, thereby allowing laser rays blocked by the blank material in the forward-and-backward movement of the blank material in a detection area not to irradiate the laser receiving screen and unblocked laser rays to be received by a laser inducing screen; acquiring forward-and-backward running displacement of the blank material via the laser inducing screen; converting laser information into electrical signals through a processor; and displaying the electrical signals through a display screen so as to display the displacement information of the blank material. The detection method for the position of the blank material provided by the invention can realize non-contact dynamic measurement of the forward-and-backward movement positions of the high-temperature blank material, and measured data is automatically displayed on the electronic screen; thus, field operators can conveniently, timely and accurately learn about the displacement of the blank material, so the hot blank material can be rapidly and accurately positioned and the utilization ratio of glass powder is increased by about 15%.