The invention provides an energy-saving type high-frequency door leaf assembling device. The energy-saving type high-frequency door leaf assembling device comprises a supporting mechanism and an ejection pressing mechanism. The ejection pressing mechanism comprises an upper-left pressing block, an upper-right pressing block, a lower-left pressing bock, a lower-right pressing block, a left side pressing block and a right side pressing block, wherein the left end of the upper-left pressing block is bent downwards, and the right end of the upper-left pressing block is bent rightwards to eject the upper-left corner of a door leaf; the right end of the upper-right pressing block is bent downwards, and the left end of the upper-right pressing block is bent leftwards to eject the upper-right corner of the door leaf; the left end of the lower-left pressing block is bent upwards, and the right end of the lower-left pressing block is bent rightwards to eject the lower-left corner of the door leaf; the right end of the lower-right pressing block is bent upwards, and the left end of the lower-right pressing block is bent leftwards to eject the lower-right corner of the door leaf; the left side pressing block extends along the left side of the door leaf to eject the left side of the door leaf; the right side pressing block extends along the right side of the door leaf to eject the right side of the door leaf; and high-frequency heating electrodes are arranged in the upper-left pressing block, the upper-right pressing block, the lower-left pressing block the lower-right pressing block, the left side pressing block and the right side pressing block and used for heating the four corners and the two sides of the door leaf.