A high-dimension chaotic laser secrecy communication system disclosed by the present invention comprises an emission terminal and a reception terminal, the emission terminal comprises a first tunable laser, a second tunable laser, a first Mach-Zehnder modulator, a first radio frequency amplifier, a first photoelectric detector, a first optical delay line and a first optical fiber coupler, and the reception terminal comprises a third tunable laser, a second Mach-Zehnder modulator, a second optical fiber coupler, a second optical delay line, a second radio frequency amplifier, a second photoelectric detector, a third photoelectric detector, a fourth photoelectric detector and a summator. The high-dimension chaotic laser secrecy communication system of the present invention uses the tunable lasers to generate the chaotic carriers and the load information, by controlling the switching and matching of the wavelengths of the lasers, and on the condition that a third party does not know the wavelengths, enables the information decoding difficulty to be improved substantially, and has the important significance for the enterprises and departments having the secrecy demands, and especially for the national defense information security field.