User portrait construction method and system based on big data

The invention relates to the technical field of big data, in particular to a user portrait construction method and system based on big data. The method comprises the following steps: performing user data deep mining based on a big data technology to generate multi-dimensional user behavior data and user medical health data; performing dynamic behavior analysis on the multi-dimensional user behavior data to generate user dynamic behavior data; performing behavior appeal mining analysis on the user dynamic behavior data to generate user behavior demand data; performing driving motivation speculation processing on the user behavior demand data to generate user behavior motivation data; performing interest keyword detection on the multi-dimensional user behavior data according to the user behavior motivation data to generate interest keyword data; performing topic association extraction on the multi-dimensional user behavior data based on the interest keyword data to generate behavior topic vector data; and perfo