Curcuma aromatica active extract, sterilization preparation and application of curcuma aromatica extract

The invention provides a curcuma aromatica active extract, a sterilization preparation and application of the curcuma aromatica active extract. Dried and smashed curcuma romatica stems and leaves or root tubers are leached for 8-24 hours through extractant and then leached for 0.5-2 hours under ultrasonic waves of 30-60 Hz at 30-50 DEG C, and leach liquor is gathered; the leach liquor is subjected to rotary evaporation and concentration at 30-55 DEG C, and an extractum-shaped curcuma aromatica active extract is obtained after the extractant is separated, and then is extracted and separated through an extracting agent to obtain the finished product curcuma aromatica active extract. The extractum-shaped curcuma aromatica active extract and the finished product curcuma aromatica active extract can be used for restraining and killing plant pathogenic fungi and preparing the sterilization preparation. A preparation method is simple, and various plant pathogenic fungi can be effectively restrained and killed. The raw materials of the sterilization preparation are wider in source, biological activity is high, no contaminants remain, and through ultrasonic wave extraction, active substances are released more comprehensively.