The invention provides a method for preventing electric 
precipitation explosion venting during blowing igniting of semi-steel 
steelmaking, and belongs to the technical field of converter 
steelmaking methods. According to the technical scheme, the 
mixed gas of 
oxygen and 
nitrogen is used for igniting and blowing in the blowing stage, instead of single 
oxygen; the total amount of the 
mixed gas is the amount of the 
oxygen supplied for normal blowing, wherein the flow rate of oxygen is 50 to 60% of the amount of oxygen supplied for normal blowing; the 
gas supply pressure required by normal blowing is provided to a 
smelting pool; the jet 
impact area and 
penetration depth are improved; the igniting time is reduced; if the raise of the temperature of an inlet of an 
evaporative cooler is beyond 4 DEG C, the flow rate of oxygen can be gradually raised, and simultaneously the flow rate of 
nitrogen can be reduced; the 
nitrogen is stopped after the flow rate of oxygen is raised to reach the normal 
oxygen supply; and the contents of CO and O2 in 
smoke are controlled to be beyond the explosion venting range. According to the method, the problem which enables the enterprise to be bothered for a long time that electric 
precipitation explosion venting occurs during blowing igniting of converter semi-steel 
steelmaking can be solved in a simple way; the 
potential risk is removed; the production can be carried out smoothly; a great contribution is brought for the safe and efficient production of semi-steel steelmaking.