The invention discloses a novel flow regulator and metering instrument integrated device. The novel flow regulator comprises a circular rectifying plate, wherein a plurality of circular holes are formed in the rectifying plate; the circular holes are radially distributed by taking the center of the rectifying plate as a reference; and the hole diameters are sequentially reduced from inside to outside. The metering instrument integrated device comprises a front cut-off valve, a flow regulator, a front straight pipe section, a precession vortex flowmeter, a rear straight pipe section and a rearcut-off valve which are sequentially connected. According to the novel flow regulator and metering instrument integrated device, through the integrated design of the flow regulator and the precessionvortex flowmeter, airflow vortexes in a pipeline can be effectively eliminated, the speed distribution distortion is improved to a certain extent, the metering precision of the precession vortex flowmeter is effectively improved under the condition that the occupied area is reduced, the condition that the rectification effect is not ideal due to the fact that the flow regulator is carelessly mounted or the adaptability to metering equipment is poor is reduced, and a reference standard is provided for the integrated production design of the flow regulator and the metering instrument.