The invention provides an automatic thermal-imaging security check device. The automatic thermal-imaging security check device comprises a thermal-imaging detector, a controller, a security check gate, a CCD (charge coupled device) sensing device, an infrared switch and a display device. The security check gate is arranged at an entrance of a security check passage, and the infrared switch is arranged at an exit of the security check gate. The automatic thermal-imaging security check device has the advantages that the gate is controlled to open through detection of thermal images, and the CCD sensing device is opened; the display device displays real-time infrared thermal images in real time, and accordingly, abnormities are checked conveniently.