Sheep placenta extracting solution with whitening function as well as extraction method and application thereof

The invention provides a sheep placenta extracting solution with a whitening function as well as an extraction method and application thereof. The extraction method comprises the following steps: performing separating to obtain sheep placenta cotyledons, soaking the sheep placenta cotyledons in peracetic acid, and then cleaning the sheep placenta cotyledons, and crushing and homogenizing the sheepplacenta cotyledons to obtain sheep placenta slurry; oscillating and extracting the sheep placenta slurry, and performing centrifuging to obtain precipitate and supernatant, adjusting the supernatantto be neutral, then carrying out microfiltration to obtain a microfiltrate, and continuing to carry out ultrafiltration on the microfiltrate to obtain an ultrafiltrate; adding water into the precipitate, adjusting the pH value of a mixed solution to be alkaline, and then performing oscillation extraction on the mixed solution at 50-65 DEG C; cooling the extracted mixed solution to room temperature, adjusting the pH value