Online regulation and control preheating device using induction heating and preheating method

The invention discloses an on-line regulation and control preheating device using induction heating and a preheating method. The on-line regulation and control preheating device using induction heating comprises a protective shell, a heat preservation shell is arranged in the protective shell, a plurality of isolation supporting pieces are arranged in the heat preservation shell, an annular heat preservation layer is arranged on the isolation supporting pieces, and a heating coil is attached to the outer side of the heat preservation layer. A heating plate is arranged on the inner side of the heat preservation layer, a pressing plate matched with a cavity formed by the heating plate in shape is arranged at the top of the cavity formed by the heating plate, and a power rod enabling the pressing plate to act in the cavity formed by the heating plate is fixedly connected to the pressing plate. According to the method, the pressing plate is adopted for assisting in forming, pressing forming can be conducted while