Sampling device for lubricating oil detection

The utility model relates to the technical field of lubricating oil detection, discloses a sampling device for lubricating oil detection, and solves the technical problems that when lubricating oil is extracted from a tank car at present, a sampling bottle generally needs to be hung through a lifting rope, the sampling bottle is put into the tank car, the sampling bottle needs to be swung, and a bottle opening of the sampling bottle is in contact with the lubricating oil. Comprising a sampling barrel and a polished rod, the middle of the bottom end of the sampling barrel is fixedly connected with an input pipe through a one-way valve, the top end of the sampling barrel is fixedly provided with a blocking cover, air holes are formed in the two sides of the top end of the blocking cover, the blocking cover is slidably connected with a lifting rod, and the bottom end of the lifting rod is fixedly connected with a piston; the sampling barrel and the piston can be supported through the polished rod and the lifting