The invention relates to the technical field of 
engineering science, in particular to an opening reserving device for subway monolithic 
track bed concrete and a construction method of the opening reserving device for the subway monolithic 
track bed concrete. The opening reserving device for the subway monolithic 
track bed concrete comprises an embedded 
pipe structure. The embedded 
pipe structure comprises a steel 
pipe. The 
steel tube is provided with a plurality of connection reinforcing steel bars in the circumferential direction in an outward extending manner. The embedded pipe structure comprises a first embedded pipe structure buried on a 
station hall layer and a second embedded pipe structure buried on a platform layer. The bottom of the first embedded pipe structure and the top of the second embedded pipe structure are connected through an inclined connection pipeline. Compared with the prior art, the opening reserving device for the subway monolithic track 
bed concrete is of a 
composite structure which is simple and practicable, and the opening reserving device is easy to 
mount and demount. The opening reserving device for the subway monolithic track 
bed concrete and the construction method have the advantages that by the adoption of the method reserving a concrete opening and a concrete transportation pipeline on a 
station shield shaft within every range of 5 km - 6 kmof the underground line, the defects existing in the long-distance concrete transportation process are overcome, the ground reserved opening, the first embedded pipe structure and the second embeddedpipe structure guarantee the construction progress, 
transportation cost can be effectively lowered, and the transportation quality of the concrete can be guaranteed at the same time.