A Tripod turnstile security gate is a waist-high access control system with a 3-arm barrier that is used to control the entry and exit of crowds are needed. A tripod security gate is made with a simple compact design. It can run smoothly by basic operation and can prevent illegal in and out. A tripod gate can be operated with very low noise. A tripod security gate can be integrated with various kinds of identification technologies, barcodes, QR scans, fingerprints, face recognition, and so on to manage the flow control. A tripod security gate runs more smoothly and more effectively than other turnstile gates. The middle arm barrier will drop down automatically or free passing when power is off in a tripod security system.