The invention provides a two-tone tunable continuous variable entanglement state generation and detection device which is characterized by comprising a single-frequency continuous wave laser (1), an optical isolator (2), a two-way pumping nonlinear optical tuner (3), a seed light injection system (4), a cavity light and phase locking system (5) and a two-tone entanglement light balance zero beat measurement system (6). Two quantum optical components of an optical parameter oscillator and an optical parameter amplifier are cleverly combined, thus the two-tone tunable continuous variable entanglement state generation and detection device has the advantages of compact structure and good stability, and can be used for generating and detecting a two-tone tunable continuous variable entanglement state optical field with high entanglement and high balance quadrature component correlation.