The invention relates to a site early warning method for pile slipping in the oceanographic engineering piling process. The site early warning method includes the following steps: a sensor is installed on a steel pipe pile and connected with a piling data collecting and analyzing device through a connector and a cable, the piling data collecting and analyzing device is debugged and prepared, and corresponding protection measures are taken to the connector of the sensor and the cable; when a pile hammer is used for piling, the steel pipe pile is tested, the site force and speed monitoring data collected by the piling data collecting and analyzing device are output to form a data file to be led into a computer, and meanwhile the singular point force and speed data are processed in the piling process to provide real-time warnings on pile slipping dangerous points, timely reduce the hammering frequency and the hammering energy of the piling hammer and control the single-hammer injection degree of the steel pipe pile. According to the site early warning method, whole-process monitoring and real-time early warning in the oceanographic engineering piling process can be achieved, and influences of the site environment and the construction condition on the piling process can be monitored in a real-time mode.