The invention discloses a deposition type silicon-calcium phosphorite double-reverse floatation technology. Magnesium is removed through the reverse floatation processes of one-time roughing (dosing is conducted in two stages) and one-time scavenging, and scavenged concentrates return to be roughed; after the magnesium is removed and before desiliconizing, desliming treatment is conducted through a sedimentation method; desiliconizing is conducted through the reverse floatation processes of two-time roughing and one-time scavenging; phosphorite of tailings obtained in the first roughing step is low in grade and has a great deal of foam, and the tailings are directly discharged; tailings obtained in the second roughing step are scavenged; and scavenged concentrates return to be desiliconized and roughed. The influence of the floatation temperature on the double-reverse floatation technology is quite less, normal-temperature floatation can be achieved, and the requirement for the grain size of ore grinding is low, thus considering from the two aspects, compared with an obverse floatation technology or a reverse-obverse floatation technology, the ore grinding cost and energy consumption can be reduced.