Box type heat exchanger and water chilling unit

The utility model relates to a box type heat exchanger and a water chilling unit, the box type heat exchanger comprises a cold medium layer and a hot medium layer which are alternately stacked, the cold medium layer and the hot medium layer are separated through a core plate, and the cold medium layer and the hot medium layer are both provided with fins. The fin is formed by arranging a plurality of combined modules in the preset flowing direction M, each combined module is provided with a liquid flow channel extending in the first direction A, the multiple liquid flow channels are arranged in parallel in the second direction B, and the side wall of each liquid flow channel is arranged in a staggered tooth shape in the second direction B so that the adjacent liquid flow channels can communicate with each other; the first direction A is perpendicular to the second direction B, and the extending directions of the liquid flow channels of the adjacent combined modules form an included angle. According to the box