Coffee brewing mechanism and method for making coffee by using mechanism

The invention relates to a coffee brewing mechanism which comprises a brewing box, an end cover, a switch assembly, an inner box and an air pump, the interior of the brewing box is hollow and is provided with a top opening, and a dripping opening is formed in the bottom wall of the brewing box; the end cover is detachably connected to a top opening of the brewing box; the switch assembly is used for controlling opening and closing of the dripping opening; the inner box is arranged in the brewing box, and an extraction cavity capable of containing coffee powder is jointly formed between the inner box and the end cover; a filtering hole capable of pressing the extraction liquid into the brewing box in a state of applying pressure into the inner box is formed in the bottom wall of the inner box; the air pump is used for introducing air into the extraction cavity. When the coffee brewing mechanism is used, coffee powder and water are added into the inner box; the dripping opening is maintained to be closed, after