Can soy milk powder be used as yogurt?

Theoretically, you can, but you need yogurt fermentation bacteria to ferment. You won't know what the taste is until you taste it, but one thing is definitely edible.

If you want to choose yogurt fermented bacteria powder, I suggest you pay attention to "a beautiful life". Compared with imported bacteria purchased and processed, indigenous bacteria (which have applied for more than 30 national patents) are more suitable for China people's intestinal flora environment.