The invention discloses a combined uniform heating device which comprises a to-be-heated container. At least one heating device packages the to-be-heated container. The heating device comprises an insulating frame. The insulating frame is a micarex. A resistance wire winds the micarex. An insulating layer wraps the resistance wire. A housing warps the insulating layer. When a plurality of heatingdevices are arranged, each heating device can move along the outer side of the to-be-heated container. The combined uniform heating device effectively prevents heating non-uniformity caused by heatingby the resistance wire and eliminates cold points and hot points in resistance heating for ensuring uniform temperature of the heating surface. The combined uniform heating device has advantages of long service life, high thermal insulating performance, high mechanical performance, high corrosion resistance, high magnetic field resistance, etc. If an insulating device is added on the external heat radiating surface and a far-infrared radiating coating is plated on the inner heat radiating surface, electric power can be saved by 35%.