Blowing desulfurization method for molten iron of torpedo ladle

The invention discloses a blowing desulfurization method for molten iron of a torpedo ladle. The method sequentially comprises the following steps of: inputting molten iron, carrying out temperature measurement, sampling, blowing by using two L-shaped spray lances, adding a slag diluting modifier, putting up the lances to terminate blowing, carrying out temperature measurement, sampling, adding a heat insulation agent and outputting the molten iron, wherein in the step of blowing by using the lance, the two L-shaped spray lances are inserted in the torpedo ladle in a cross tilting manner so as to simultaneously carry out blowing desulfurization, and the blowing ports of the two L-shaped spray lances are respectively directed to two end walls of the torpedo ladle. The blowing desulfurization method for the molten iron of the torpedo ladle is high in desulfurization efficiency, high in production capacity, simple in operation, convenient in implementation, stable in desulfurization and low in cost and is suitab