The invention discloses a method for improving quality of a head slab of an IF steel casting slab. The method includes: adding a covering agent when molten steel tonnage of a continuous casting tundish reaches 35 tons; putting start powder and crystallizer casting powder onto a crystallizer platform; controlling pulling rate after starting at 0.2m/min, increasing the pulling rate to 0.4m/min at increasing acceleration less than or equal to 0.05m/min2, and maintaining for 30s+/-5s; increasing the pulling rate from 0.4m/min to 0.8m/min at increasing acceleration less than or equal to 0.05m/min2,and maintaining for 30s+/-5s. Through a series of measures like reasonably controlling adding moment of the covering agent of the tundish, reasonably controlling start tonnage of the tundish, increasing floating time of inclusion, reasonably controlling adding moment of the start powder and the casting powder into a crystallizer and optimizing tensioning speed when starting casting, entrapped slag can be well controlled to be mingled within a range of 4m of the head, yield is increased, and loss caused by the fact that cutting length is too long is lowered.