Illegal transactions represented by online gambling have seriously damaged the online payment environment. The risk control crawler system in this report is divided into：website basic data maintenance system，betting website positioning system，markup template and intelligent extraction crawler system，distributed task distribution system，text analysis system and image recognition analysis system. By matching the key effective information of the crawler monitoring system，the illegal trading order of the gambling website can be found timely and effectively，and displayed in the background console interactive interface in time，and the result is reported to the risk control business department for processing，and the system will be automatically implemented if necessary. Early warning measures are intervened. On this basis，the countermeasures and suggestions for further improving the illegal transaction monitoring and analysis system of the gambling website using the crawler system are proposed.