Peritectic steel covering slag containing multiple metal oxides

The invention discloses peritectic steel covering slag containing multiple metal oxides. According to chemical ingredients of the corresponding type of steel, 0.08-0.22% of C is included, Si is smaller than or equal to 0.30%, S is smaller than or equal to 0.045%, and P is smaller than or equal to 0.045%. The peritectic steel covering slag is characterized in that, according to the chemical ingredients of the covering slag, by weight ratio, CaO is larger than or equal to 30% and smaller than or equal to 40%, SiO2 is larger than or equal to 20% and smaller than or equal to 30%, F- is larger than or equal to 6.5% and smaller than or equal to 7.5%, Na2O is larger than or equal to 10% and smaller than or equal to 15%, MgO is larger than or equal to 2% and smaller than or equal to 3%, Al2O3 is larger than or equal to 3% and smaller than or equal to 4%, Fe2O3 is larger than or equal to 2% and smaller than or equal to 5%, Cr2O3 is larger than or equal to 1% and smaller than or equal to 10%, MnO is larger than or equal to 2% and smaller than or equal to 7%, C solid is larger than or equal to 3% and smaller than or equal to 5%, and the balance is impurities. CaO/SiO2 ranges from 1.2 to 1.4. By means of the covering slag, the peritectic steel surface thermal radiation absorption capacity is effectively improved, and finally the total casting blank surface crack occurrence rate is lowered.