The invention discloses a treatment method for rare earth ore concentrates. The treatment method for the rare earth ore concentrates comprises the following steps: mixing chloride of magnesium with rare earth ore concentrates, and then roasting under the condition of air to form a roasted product, wherein the weight ratio of the chloride of the magnesium to the rare earth ore concentrates is 0.5-1.9-1, the weight ratio of MgCl2 in the chloride of the magnesium to the rare earth ore concentrates is 0.23-0.9: 1, the roasting temperature is 460-580 DEG C, and the roasting time is 30-200 minutes;and (2) directly leaching the cooled roasted product by using an acidic solution, wherein the leaching rate of rare earth metals is 95% or above. The high leaching rate can be realized at a low temperature, and the roasted product can be prevented from becoming a fused solution.