Solid basic catalyst and preparation method and application thereof

The invention relates to a novel solid basic catalyst, a preparation method and application thereof to biodiesel transformation. The solid basic catalyst comprises calcium oxide, magnesium oxide and zinc oxide in the mass ratio of (1.0-3.2):(0.6-3.9):(1.0-16.5). By adopting the invention, a solid basic catalyst can be prepared at low cost, biodiesel can be obtained by quickly and efficiently catalyzing an ester exchange reaction between plant oil and methanol, the biodiesel can be separated from byproducts and the catalyst by centrifuging, and product separation is easy; meanwhile, the production cost can be lowered greatly, and the production efficiency is improved.