This application provides a positioning reference signal PRS association method and a communication apparatus. The method includes: A terminal device receives second configuration information sent by a positioning management device, where the second configuration information indicates an association relationship between PRSs on at least two frequencies; and the terminal device measures the PRSs having the association relationship, where the PRSs having the association relationship share a same antenna port or the PRSs having the association relationship have a phase difference. By implementing this application, large-bandwidth PRS configuration can be implemented.