Flat pipe heat exchanger and assembly method thereof

The invention discloses a flat pipe heat exchanger. The flat pipe heat exchanger comprises fins provided with pipe channel slots, and flat pipes which are fixedly connected with the fins; each pipe channel slot is U-shaped; the pipe channel slots are provided with flangings; and the side wall of the flat pipe is provided with fixed inclined sides corresponding to the flangings. The invention also discloses an assembly method of the flat pipe heat exchanger. The method comprises the following steps of: 1) fixing the flat pipes at intervals corresponding to the pipe channel slots; 2) horizontally pushing the fins into the flat pipes; 3) clamping the fixed inclined sides by using a clamping device to ensure that the fixed inclined sides are tightly connected with the flangings; 4) continuously inserting the next fin; and 5) connecting two ends of the flat pipes and an inlet collecting pipe and an outlet collecting pipe respectively to finish assembly. The flat pipes are inserted in the horizontal direction, the