The invention discloses a security certification method, a system and equipment for internet access, which is applied in high-speed traffic tools. The security certification method comprises the following steps: a MNMS (mobile-customer IP network management server) generates a public key and a private key for each HMG (high-speed mobile gate); the public key is issued to an AP (access point); each private key is issued to the corresponding HMG; the MNMS generates a first signature for related information of the HMG by using the private key and the AP, and issues the generated first signature and the related information of the AP for the HMG to the corresponding AP; the AP carries out certification on the first signature in the issued information by using the public key, if the certification is passed, the related information in the information is extracted for storage, and a broadcast notice is sent to a coverage range; the HMG judges whether the AP is legally accessed, if so, the HMG utilizes the private key and the AP to generate a second signature for the related information of the HMG, and sends a certification request containing the second signature and the HMG identification to the broadcast AP; and the AP carries out certification on the second signature in the certification request by using the public key.