This paper deals with the distributed adaptive platooning control problem of autonomous vehicles connected via ad-hoc networks under Denial-of-Services (DoS) attacks. The vehicle platoon is composed of a leader vehicle and the following vehicles, each transmitting the information through the wireless channel. The wireless network is vulnerably attacked by DoS attacks, which will cause data packet loss and communication interrupt. This paper designed a distributed adaptive RBF sliding mode observer to solve this problem and proposed a fast recovery mechanism. Firstly, the detection method will detect whether the communication topology contains a spanning tree. If it contains, no action will be used. Otherwise, the link failure number will be counted. If the link failure number