The invention discloses a pipeline component of a gas leakage metering detection device and relates to the gas detection technology field. A first pipeline of a pressure sensor arranged in an internal portion is vertically connected to a gas inlet pipeline. A second pipeline is vertically connected to the first pipeline, and the second pipeline and the gas inlet pipeline are located on a same side of the first pipeline. A pipe channel is provided with a third pipeline which controls a stop valve and is vertically connected to the second pipeline. A fourth pipeline connecting a pressure release valve is vertically connected to the third pipeline. A fifth pipeline is vertically connected to the third pipeline, and the fifth pipeline and the second pipeline are located on a same side of the third pipeline. The fifth pipeline, a gas outlet pipe and a sixth pipeline are connected through a three-way valve. The sixth pipeline is used for connecting a ball valve and a gas flowmeter. By using the pipeline component of the gas leakage metering detection device and a processing molding method thereof, component layout and a type selecting design are reasonable; an inner wall anticorrosion processing step is added to a processing method so that corrosion resistance performance of the pipe channel is increased by about more than 50%; and under a regular usage condition, a replacement frequency is reduced about 30%.