Abstract: A portable multi-purpose electric oven comprises: case-shaped upper and lower covers which can be opened and closed and have a handle; a pair of insert roasting plates with a built in heating device, wherein the plate has on one surface a plurality of protruding bars to form grids for roasting and the other surface of the plate is a plane for frying, and the transformation between the functions of frying and baking can be achieved if the plate is inserted reversely again after being pulled out; a pair of electrical outlets inside the upper and lower covers which can automatically spring up and are connected with the heating device inside the pair of the roasting plates; a pair of oil collecting cups for collecting oil flowing out from channels between the protruding bars on the pair of roasting plates; a heating plate which can be inserted over the roasting plates; and a set of electronic controlling devices comprising a plurality of buttons and indicator lights.