Anti-turn-back human body security check device

The invention relates to an anti-turn-back human body security check device. The anti-turn-back human body security check device includes a ray transmitting device, a ray receiving device, a control device and a movement check channel arranged between the ray transmitting device and the ray receiving device. Anti-turn-back devices are mounted on two sides of the movement check channel and are arranged at the entrance and the exit of the movement check channel. The anti-turn-back device at the entrance is divided into two parts respectively arranged on the bars on two sides of the movement check channel and protruding towards the movement check channel. The two parts are different in height. The height of the top of the anti-turn-back device on the bar in front of a to-be-checked person is equal to that at the position of the thighs of the to-be-checked person. The height of the top of the anti-turn-back device on the bar behind a to-be-checked person is equal to that at the position of the knees of the to-be-checked person. By adopting the above device, turn-back of the to-be-checked person can be prevented effectively during a security check process.