The invention discloses a surface-scraping type heat exchanger and a margarine production system device. The surface-scraping type heat exchanger comprises a heat exchanger cylinder and a hollow rotary cylinder. The hollow rotary cylinder is loosely sleeved in the heat exchanger cylinder, and can be rotated freely in the heat exchanger cylinder. An open liquid storage tank is arranged above a feedpipe of the heat exchanger cylinder of the surface-scraping type heat exchanger, an arc-shaped surface base is arranged at the bottom of the hollow rotary cylinder, the arc-shaped surface base is located in the open liquid storage tank, and the arc-shaped surface base fits with the inner side of the open liquid storage tank; and a plurality of liquid storage boxes are arranged on the sides of thehollow rotary cylinder, the outer sides of the liquid storage boxes fit with the inner wall of a charging barrel, the liquid storage boxes are connected to automatic distribution valves, the bottom of the hollow rotary cylinder is provided with a passage, and the passage is connected to the liquid storage boxes through the connection between pipelines and inlets and outlets of the automatic distribution valves. The above-mentioned surface-scraping type heat exchanger is applied to a quenching machine of the margarine production system device. The invention relates to the field of food processing and production technology and equipment manufacturing.