The invention discloses a method and device for predicting and analyzing WLAN sites. The method includes: acquiring the network coverage of an existing network; analyzing, to be more specific, acquiring the data business distribution of each base station in the network, and acquiring a grid-level data business density distribution diagram according to the data business distribution and the networkcoverage; identifying hot spot regions according to the grid-level data business density distribution diagram, and acquiring one or more candidate WLAN sites according to the hot spot regions; selecting the WLAN sites according to a WLAN capacity-coverage model and a link budget module, the grid-level data business density distribution diagram, an existing network business shunt proportion, and the peripheral geographical environment and user distribution of each candidate WLAN sites. The method for predicting and analyzing the WLAN sites is low in cost, little in artificial participation, widely applicable, high in precision and the like.