The utility model provides a construction structure of a shield over-invasion limit box culvert. The construction structure comprises a plain concrete backfill layer, a compression-resistant floatingplate and a mortar buffer layer, the plain concrete backfill layer is formed by backfilling plain concrete at the position, corresponding to the chiseled area, in the box culvert after chiseling the box culvert bottom plate invading the shield tunnel area, the backfill ranges of the two sides of the plain concrete backfill layer extend to the two sides of the chiseled area by 2-3 m respectively, and the backfill height is 30-50 cm higher than the upper portion of the shield tunnel area; the compression-resistant floating plate is a reinforced concrete supporting framework formed by pouring concrete after steel bars are implanted into the side walls, corresponding to the side box culverts, of the top face of the plain concrete backfill layer. And the mortar buffer layer is a mortar layer formed by grouting the rear side of the shield segment after the shield is finished. According to the construction structure, the shield can directly penetrate through the box culvert invasion area, inert thick slurry is injected outside the shield body, water and soil flow behind the shield tail of the shield tunneling machine is effectively blocked, and the problem that the box culvert invades into the tunnel range is solved.