The invention discloses a flat type metal tube and a manufacturing technique thereof. The flat type metal tube comprises a tube body, wherein the whole tube body adopts a flat type structure and comprises a tube cavity and a tube wall encircling the tube cavity in the axial direction; the tube wall comprises flat walls located at an upper end and a lower end of the tube cavity and an arc-shaped wall connecting the flat walls; the thickness of the tube body is 1.5 to 3.0 mm; the width of the pipe body is 2.0 to 4.0 mm; the thickness of the pipe wall is 0.1 to 0.3 mm. The invention further discloses the manufacturing technique of the flat type metal tube. The manufacturing technique comprises the following steps: a. molding; b. compound winding; c. annealing; d. sinking drawing; e. straightening and cutting; f. washing; g. packaging. In a heat tube manufacturing process with the flat type metal tube disclosed by the invention, a flattening step can be omitted, so that the problem that a capillary structure is easy to deform and disintegrate in the flattening process is solved; the flat type metal tube is low in thermal resistivity, and good in heat transfer effect; the manufacturing technique of the flat type metal tube is low in manufacturing cost, and convenient and simple in production.