Center projection type pipeline intersecting line marking device

The invention relates to a central projection type pipeline intersecting line marking device. The problems that intersecting line marking equipment is poor in universality, troublesome to use and not suitable for large-diameter pipelines are effectively solved. According to the technical scheme, the device comprises a head and a supporting rod, the head comprises a hollow shell, a light-transmitting cover is fixed to the right end of the shell and made of reversible color-changing materials, a first point light source is arranged in the shell, and a parallel light beam projection unit is installed on the concave face side of the light-transmitting cover through a horizontal installation rod. The parallel light beam projection unit can project parallel light beams to the light-transmitting cover, and the color or light transmittance of the light-transmitting cover in the area where the parallel light beams are projected can be changed. According to the equal-ratio amplification principle of central projection