Disclosed is a method for establishing an unconditional security communication model based on the combination of beamforming and security coding. The method comprises: a legal sending user sends a pre-coded and modulated signal, and an eavesdropping user receives the signal and calculates an eavesdropping bit error rate; a security coding parameter is calculated, a legal receiving user sends a pilot frequency sequence, and the legal sending user estimates a legal channel, extracts information about the legal channel to perform SVD pre-coding on the signal subjected to security coding and modulation, and sends the signal; and the legal receiving user or the eavesdropping user receives the signal and decodes same, performs judgement and demodulation on the decoded signal, and performs security decoding on a demodulated binary bit stream to obtain a transmitted signal or eavesdropped signal. Since the eavesdropping user lacks information about the legal channel, pre-coding processing of the received signal cannot be released, so that the bit error rate is high. The method can achieve the establishment of an advantageous channel in an eavesdropping signal model, and ensure that the legal user receives signals under a low bit error rate.
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