The invention relates to a medical used measuring instrument, in particular to an instrument utilizing a laser speckle technology to perform the measurement to the blood flow of the eyeground, to be exact, the invention is a measuring instrument of the laser speckle method eyeground blood flow, which comprises a laser speckle collector, a data processor of which the input end is connected with the output end of the laser speckle collector and a terminal display of which the input end is connected with the output end of the data processor. The invention adopts face scanning, the mechanical and electronic control parts of a measuring mechanism and is simple compared with SLDF/HRF, therefore, the cost of the instrument is relatively lower, and the operation is relatively easier. In addition, the invention also fills up a vacancy in the aspect of the study of an eyeground blood flow imaging instrument in China, the invention is helpful for quickening the study of the disease caused by the change to the eyeground blood flow in China, simultaneously, a diagnosis can be performed to a relevant disease through the measurement to the blood flow. Through the study to the rule of an eyeground blood flow change, the invention is in favor of preventing the disease related with the blood flow such as glaucoma and diabetes mellitus.