The BR0.7 type plate heat exchanger is an important device for large-scale air-conditioning system exhaust energy recovery, high-temperature flue gas waste heat recovery and computer CPU heat dissipation. The structure has a vacuum liquid-filled head and a core body. The vacuum liquid-filled heads are provided on both sides of the vacuum liquid-filled channel. One side of the vacuum liquid-filled head is provided with a tube. It is constructed by stacking at intervals. The vacuum liquid-filling channel is provided with partitions on the upper and lower sides, and seals on both sides, and fins can be arranged in the channel. The plate-fin channel is provided with partitions above and below, seals are provided on both sides, and fins are provided in the channel. Each plate-fin channel is divided into two parallel hot medium channels and cold medium channels by a strip. After assembly, the whole is arranged horizontally or vertically.