The invention discloses a BIM based domestic hot water machine room assembly production device and technology and relates to the field of building equipment. According to the technical scheme, the device comprises a bottom table front rod group; a bottle table comprises a table board and a support plate on the lower side of the table board; a through groove is formed in the middle of the table board; a movable component front rod group in sliding fit with the through groove is arranged in the through groove; a plurality of bearing component front rod groups for bearing to-be-cut pipelines arearranged on the two sides of the through groove on the table board; and the bearing component front rod groups are connected with the movable component front rod group in an inserting manner. The device has the following benefits: cutting of a heat exchanging system pipeline and welding of a flange plate can be realized through the device; and the device is combined with a BIM model to segment pipelines with different diameters and lengths in a whole set of prefabricated pipeline in order, so that the pipeline length adjusting time is greatly shortened when the heat exchanging system is assembled in later period. A unique feeding system of the device can realize more precise feeding distance control.