The invention provides an intelligent detection system for blade surface detects of a wind turbine generator system. The intelligent detection system comprises an image pickup system, a programmable software detection system and a communication system, wherein the image pickup system comprises a support and an image pickup apparatus, an adjusting apparatus comprises a pitch angle adjuster and a horizontal adjuster, and the programmable software detection system comprises an image acquisition module, an image analysis and screening module, an image classification module, an image filter module,an image processing module, a defect identification module, a calculation defect position and geometric characteristic information module, a defect analysis suggestion module and a defect detection report output module which are successively connected with one another. The intelligent detection system has a digital image processing function, analyzes and processes an acquired image, extracts a defect image and automatically generates a defect report, so that the intelligent defection for the blade surface defects of the wind power generator system can be realized; and compared with the existing defection means, the intelligent detection system has the advantages of convenience and flexibility in detection, less time, remote detection, accurate detection result and no safety potential hazard.