The invention relates to an assembly structure of a precast track top air duct and a construction method for the same. The assembly structure comprises a structural plate and the precast track top airduct, wherein the precast track top air duct comprises multiple units of the precast track top air duct which are spliced successively along the longitudinal direction of the air duct; an assembly component is disposed on each of the units of the precast track top air duct; multiple assembly holes are formed in the structural plate; the assembly components have the same quantity with the assemblyholes and the assembly components and the assembly holes are disposed in one-to-one correspondence; and the assembly components extend into the corresponding assembly holes and are solidified with cast-in-place concrete which is poured into the assembly holes. Through a structure of cast-in-place wet nodes formed by the cast-in-place concrete inside the assembly holes, structural bearing capacityand durability of the assembly-type precast track top air duct can be effectively increased; and quality of the track top air duct is improved.