Construction system and construction method for underground pipeline to downwards penetrate through dynamic load road surface

The invention provides a construction system and method for an underground pipeline to downwards penetrate through a dynamic load road surface. The construction system comprises a jacking system, and the jacking system is arranged at a construction part; the tunneling system is composed of a tunneling vehicle and a conveying vehicle; the grouting system is used for conducting pre-grouting treatment on a construction part located below the dynamic load road surface, and a grouting pipeline of the grouting system at least extends to the position between a jacking pipe of the jacking system and surrounding earthwork so as to conduct high-pressure grouting treatment on the position. A plurality of auxiliary construction methods and ground grouting are adopted at the same time to improve and reinforce soil bodies around the jacking pipe, the self-bearing capacity of part of surrounding rock is mobilized, advanced support of an excavation face is formed through the jacking pipeline, jacking is conducted in time, an