A sampling device of acquiring a graphite sample from a reactor graphite block, comprising: a support placed on the reactor graphite block; a lifter configured to be insertable into the reactor graphite block in a first direction; and a sampling actuator arranged at an end of the lifter and configured to acquire a graphite sample from the reactor graphite block, wherein the sampling actuator is configured to insert into the reactor graphite block in a second direction, and the first direction is substantially perpendicular to the second direction, and wherein the sampling actuator comprises: a connecting sleeve configured to connect the sampling actuator to the lifter; a transmission shaft arranged in the connecting sleeve and configured to transmit a rotating power; and a rotary drill configured to be rotatable and to travel in the second direction, and wherein the transmission shaft is configured to transmit the rotating power so that the rotary drill moves between a feeding state and a cutting state, and in the feeding state, the rotary drill rotates forward, and in the cutting state, the rotary drill rotates reversely and applies a radial force toward the graphite sample, so as to cut off the graphite sample from the reactor graphite block, and characterised in that a cutting cam is provided at an end of the rotary drill, the cutting cam is fixed on the rotary drill by a fixing pin and is configured to cut off the graphite sample from the reactor graphite block, and wherein in response to the rotary drill rotating forward, the cutting cam follows the rotary drill and rotates in close contact with the graphite sample; in response to the rotary drill rotating reversely, the cutting cam moves reversely with the rotary drill with the fixing pin as a center; and a linear distance between a bonding surface of the cutting cam with the graphite sample and the fixing pin increases with rotation of the cutting cam, so that the cutting cam applies a radial force toward the graphite sample to cut off the graphite sample. a support placed on the reactor graphite block; a lifter configured to be insertable into the reactor graphite block in a first direction; and a sampling actuator arranged at an end of the lifter and configured to acquire a graphite sample from the reactor graphite block, wherein the sampling actuator is configured to insert into the reactor graphite block in a second direction, and the first direction is substantially perpendicular to the second direction, and wherein the sampling actuator comprises: a connecting sleeve configured to connect the sampling actuator to the lifter; a transmission shaft arranged in the connecting sleeve and configured to transmit a rotating power; and a rotary drill configured to be rotatable and to travel in the second direction, and wherein the transmission shaft is configured to transmit the rotating power so that the rotary drill moves between a feeding state and a cutting state, and in the feeding state, the rotary drill rotates forward, and in the cutting state, the rotary drill rotates reversely and applies a radial force toward the graphite sample, so as to cut off the graphite sample from the reactor graphite block, and characterised in that a cutting cam is provided at an end of the rotary drill, the cutting cam is fixed on the rotary drill by a fixing pin and is configured to cut off the graphite sample from the reactor graphite block, and wherein in response to the rotary drill rotating forward, the cutting cam follows the rotary drill and rotates in close contact with the graphite sample; in response to the rotary drill rotating reversely, the cutting cam moves reversely with the rotary drill with the fixing pin as a center; and a linear distance between a bonding surface of the cutting cam with the graphite sample and the fixing pin increases with rotation of the cutting cam, so that the cutting cam applies a radial force toward the graphite sample to cut off the graphite sample. a connecting sleeve configured to connect the sampling actuator to the lifter; a transmission shaft arranged in the connecting sleeve and configured to transmit a rotating power; and a rotary drill configured to be rotatable and to travel in the second direction, and wherein the transmission shaft is configured to transmit the rotating power so that the rotary drill moves between a feeding state and a cutting state, and in the feeding state, the rotary drill rotates forward, and in the cutting state, the rotary drill rotates reversely and applies a radial force toward the graphite sample, so as to cut off the graphite sample from the reactor graphite block, and characterised in that a cutting cam is provided at an end of the rotary drill, the cutting cam is fixed on the rotary drill by a fixing pin and is configured to cut off the graphite sample from the reactor graphite block, and wherein in response to the rotary drill rotating forward, the cutting cam follows the rotary drill and rotates in close contact with the graphite sample; in response to the rotary drill rotating reversely, the cutting cam moves reversely with the rotary drill with the fixing pin as a center; and a linear distance between a bonding surface of the cutting cam with the graphite sample and the fixing pin increases with rotation of the cutting cam, so that the cutting cam applies a radial force toward the graphite sample to cut off the graphite sample.