The invention relates to a preparation method of a sulforaphen micro emulsion fast release dripping pill. The method comprises the following steps of (1) dispersing sulforaphen into diethylene glycol monoethyl ether; (2) mixing monoglyceride linoleate, polyoxyethylenated castor oil EL and sulforaphen diethylene glycol monoethyl ether dispersion liquid; then, performing treatment by a homogenizer to obtain the sulforaphen micro emulsion; (3) mixing polyethylene glycol with the sulforaphen micro emulsion; performing uniform stirring; performing water bath heating to 40 DEG C; performing heat insulation to obtain a target mixed medicament; (4) dripping the target mixed medicament into liquid paraffin; collecting a condensed and formed solid dropping pill to obtain the sulforaphen micro emulsion fast release dripping pill. The product obtained by the method provided by the invention has the advantages that the carrying is convenient; the storage is easy; the use is convenient; the medicine is fast released, and the like. The sulforaphen is subjected to micro emulsion; the micro emulsion with the particle diameter being lower than micrometer order can be spontaneously formed in the gastrointestinal environment, so that the absorption speed and the bioavailability of the sulforaphen are improved.