The invention provides a smashing and classifying technology for molybdenite. The technology comprises the following steps that first, a gyratory crusher is used for conducting coarse crushing treatment on the molybdenite, so that coarsely-crushed mineral powder is obtained; then primary screening is carried out, and accordingly primary oversize products and primary screen underflow are obtained; second, a cone crusher is used for conducting intermediate crushing treatment on the primary oversize products, so that intermediately-crushed mineral powder is obtained; then secondary screening is carried out, and accordingly secondary oversize products and secondary screen underflow are obtained; third, the primary screen underflow and the secondary screen underflow are evenly mixed and then added into a high-pressure grinding roller to be smashed, so that smashed mineral powder is obtained; and fourth, the smashed mineral powder is classified, and hence smashed and classified products with the granularity D55 being smaller than or equal to 0.074 mm are obtained. By the adoption of the smashing and classifying technology, the technical problems that the process is long, the number of devices is large, smashing and classifying production cost is high, classification efficiency is low, easy-to-select size fraction content of the mineral is low, and the molybdenum selection recovery rate is affected in the prior art are effectively solved. The application prospect is broad.