The invention discloses a highway horizontal curve design method based on a K-shaped curve. The highway horizontal curve design method comprises the following steps: (1) defining the K-shaped curve and a k value; and (2) K-type curve characteristics, such as a parameter equation of the K-type curve under a local coordinate system, a curvature radius of any point of the K-type curve and a length ofthe K-type curve; and (3) application of the K-shaped curve in highway horizontal curve intersection point method design. Three common linear horizontal curve design elements of a symmetric single curve, an asymmetric single curve and an oval curve are mainly calculated. The K-shaped curve is compared with a cycloid, the k value can be reasonably selected according to the terrain so as to achievethe purposes of conforming to the terrain, reducing filling and digging and avoiding bad line type combination. Meanwhile, the curvature change rate of the vehicle moving track is continuous, the road plane line shape can completely coincide with the gravity center wheel trace of the vehicle, and the moving track characteristic of the vehicle and the operation characteristic of a driver are better met.