The invention relates to a frost-free refrigerator adopting the embedded micro-channel refrigerating and defrosting unit technology. The frost-free refrigerator comprises a door body, a compression bin, a box body and a compressor; the door body is located in front of the box body and is provided with a plurality of shelves; the compression bin is formed in the lower rear part of the box body, and the compressor is placed inside the compression bin; an air channel assembly and an evaporator assembly form an embedded micro-channel evaporator air channel, the embedded micro-channel evaporator air channel is fixed to the inner wall of the rear part of the box body in a buckled mode or a screw-fixed mode, the bottom end of the embedded micro-channel evaporator air channel is connected to an air return pipe, and the air return pipe communicates with the interior of the compression bin through a hole in the bottom of the box body and is connected to the compressor. According to the frost-free refrigerator, the volume fraction of the air-cooled refrigerator can be greatly increased, and the unit volume cost of the air-cooled refrigerator can be lowered; because a micro-channel evaporator is provided with a plurality of cavities, the heat exchange area can be greatly increased, and the heat exchange efficiency can be greatly improved.