An integrated structure of liquid-core fiber mid-infrared Raman laser source is established, and an all-fiber structure liquid-core coupling device is used to pump injection. A nanosecond laser with center wavelength of 1064 nm, repetition rate of 5 kHz and maximum output power of 55 mW is used as pump source, and a hollow core fiber is filled with the mixture with different proportions of carbon tetrachloride and carbon disulfide. At least seven-order Raman signal is achieved, and the longest wavelength of 2.08 μm and the minimum Raman threshold of 0.3 mW can be measured. The fiber coupling efficiency larger than 90% is achieved when we establish the liquid-core fiber coupling device with all-fiber structure. We also find that the Raman signal generated by silica fiber plays a prominent role in the generation of stimulated Raman scattering.