The utility model discloses a sampling device of a vacuum reaction kettle, which comprises a reaction kettle body, a sampling mechanism arranged on the side surface of the reaction kettle body, a sampling
barrel capable of lifting up and down arranged in a sampling box, a material suction
pipe arranged on the left side of the sampling
barrel, a
piston connected with the inner wall of the sampling
barrel in a sliding manner, and a push-pull rod fixedly connected with the surface of the
piston, the end part of the push-pull rod is fixedly connected with a first
magnet, the left side of the upper end of the sampling box is fixedly communicated with a
discharge pipe, and the end part of the
discharge pipe is detachably provided with a
sample collection mechanism. The height position of the sampling barrel can be adjusted by lifting the sampling barrel up and down, a second
magnet is utilized to adsorb a first
magnet, so that materials can be sucked into the sampling barrel from a material suction pipe, and then the second magnet is utilized to repel the first magnet, so that a
piston can be driven to move leftwards; according to the sampling device, the materials with different heights can be sampled, so that convenience is provided for a user.