Magnetic heterogeneous catalyst ((CaO-MgO)@Fe3O4/C) was prepared for co-precipitation methods and magnetic core Fe3O4/C was reduced by activated carbon under N2 atmosphere. The reaction of glycerol carboante prepared using glycerol as a probe reaction, it is investigated that the catalytic performance of (CaO-MgO)@Fe3O4/C catalyst. With (CaO-MgO)@Fe3O4/C catalyst, glycerol carbonate yield reached 98.80% and glycerol conversion reached 95.20%. The (CaO-MgO)@Fe3O4/C catalyst was characterized by magnetic hysteresis loop, X-ray diffraction (XRD), CO2-TPD and transmission electron microscopy (TEM) and BET. The results indicated that Fe3O4/C was well wrapped (CaO-MgO); the (CaO-MgO)@Fe3O4/C catalyst exhibited good magnetic properties with high saturation magnetization (23.8emu/g) and the (CaO-MgO)@Fe3O4/C catalyst had strong basicity. The different reaction conditions on the yield of glycerol carbonate were investigated. The optimal reaction conditions were as follows: the reaction temperature was 85 oC and the reaction time was 1h, the molar ratio of DMC/glycerol was 5:1 and the catalyst dosage was 5.0wt. %. The catalyst still had steadily catalytic performance after 5 cycles with a high glycerol carbonate yield of 94.45%.