Gradient induction heating device for high-strength steel

The invention discloses a gradient induction heating device for high-strength steel. The gradient induction heating device for high-strength steel comprises a heating chamber, a conveyor belt, an induction heating coil, a frequency conversion device and a control device, wherein the heating chamber is provided with a feed inlet for conveying parts; the conveyor belt penetrates through the heating chamber via the feed inlet to reach the outside, and used for conveying the parts to be heated in the heating chamber; the induction heating coil is of a taper structure with the inner diameter gradually increasing; the conveyor belt can pass through in the center axis direction of the induction heating coil; the frequency conversion device is electrically connected with the induction heating coil and used for changing the power-on frequency of the induction heating coil; and the control device is electrically connected with the conveyor belt and used for controlling the stop locations of the parts. The gradient induction heating device for high-strength steel has the characteristics that errors are small, temperature can be controlled, and the heating temperature gradient is uniform.