The invention relates to the technical field of the building of high speed railway passenger special line, disclosing a construction technology of a ballast bed of a bridge double-block ballastless track. The technology comprises the following steps: 1. ensuring that bridge sedimentation satisfies construction requirements; 2. cleaning the bridge surface; 3. building an anti-collision wall, an expansion gap and a water-proof layer; 4. laying a protective layer, and pre-embedding a shear resistant boss; 5. laying an isolating layer; 6. assembling a track skeleton; 7. laying a surface course reinforcing steel bar layer; 8. accurately adjusting the track skeleton; and 9. pouring ballast bed board concrete. The invention has the advantages that the application of a construction supporting andadjusting device and technical operation control ensure that geometric space position of the double-block ballastless track system is kept to be stable, can be adjusted in a stepless mode in the whole construction process, improves the laying precision of the bridge double-block ballastless track and effectively improves construction quality.