The invention discloses a visual environment improvement design method of a big and long highway tunnel based on a rhythmical image. A lateral wall big rhythmical image curve and a lateral wall small rhythmical image curve are arranged at a lateral wall inside a tunnel. A
road surface transverse visual illusion mark line and a
road surface white broken line are arranged corresponding to the
wave trough of the lateral wall big rhythmical image curve. The lateral wall is provided with a lateral wall vehicle distance indication mark line, thereby forming a spatial low-frequency visual information
stream. A lateral wall annular mark line and two
layers of outline marks are arranged in the tunnel; and three groups of
road surface music note mark lines are corresponding to the lateral annular mark line; and a road surface protruded road sign is provided, thereby forming a spatial intermediate-frequency visual information
stream. The lower edge of the kerbstone is provided with a red-and-white roadside vertical surface mark line, thereby forming a spatial high-frequency visual information
stream. The rhythmical visual reference
system consisting of the multiple frequencies of visual information effectively improves the sense of speed, the sense of distance, the
sense of direction, and the sense of
rhythm; and the method is applicable to the highway tunnel having a length more than 1000m, with the limit speed being 60-80km / h.