The invention discloses a quantum secure direct communication method and system based on an entanglement photon pair. The quantum secure direct communication method comprises entanglement sources, a data transmission end and a data receiving end, wherein the data transmission end comprises a first polarization beam splitter, a first Faraday rotating mirror and a controllable light switch; one output end of the controllable light switch is connected with a second Faraday rotating mirror; the controllable light switch is used for acquiring transmitted quantum bits from a data source; the data receiving end comprises a second polarization beam splitter, a third polarization beam splitter and a fourth polarization beam splitter which are connected in sequence; two output ends of the fourth polarization beam splitter are connected with one single photon detector respectively; a plurality of entanglement source are used for generating a plurality of entanglement photon pairs; one photon in the entanglement photon pairs is transmitted to the data transmission end through a combiner while the other photon is transmitted to the data receiving end through the combiner; and the received quantum bits are determined according to the photon quantity detected by the single photon detector. In the quantum secure direct communication method and system, information transmission is performed notdirectly through a communication line, so that the information transmission security is high.