Microcrystalline and cryptocrystalline low grade phosphate ore beneficiation process, comprising the steps of: (1) ore crushing, wet milled to a content of 90-92%, -200 mesh fineness; desliming (2) flotation (3) Phosphate positive flotation; (4) Carbonate reverse flotation, the product in the tank after reverse flotation sweeping operation is the final product phosphorus concentrate. The invention is used for sorting low-grade colloidal phosphate ore, which overcomes the shortcomings of the previous single positive flotation that cannot obtain qualified phosphate concentrate, and the content of harmful impurities of the obtained phosphorus concentrate can be reduced to 1.78%, reaching the wet-process phosphoric acid product. Phosphate concentrate requirements; the invention overcomes the disadvantages of low recovery rate and high energy consumption of the calcination-digestion-screw beneficiation concentrate.

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