The invention, which belongs to the technical field of photoelectric detectors, particularly relates to a balanced zero-beat photoelectric detector for non-classical light field detection in a continuous variable quantum optical experiment, in particular to a photoelectric detector for locking a relative phase between a non-classical light field and a local light field and detecting a corresponding phase non-classical light field orthogonal component in a broadband range. The invention aims at providing balanced zero-beat detector having advantages of low noise, high gain and wide bandwidth, thereby solving a problem of detection of specific orthogonal components of a broadband compressed light field and thereby realizing measurement of a specific orthogonal component of compressed light in a broadband range under phase locking of the compressed light and local light. The balanced zero-beat photoelectric detector has advantages of low noise, high gain, wide broadband, alternating-current and direct-current monitoring and phase locking and the like. The balanced zero-beat photoelectric detector can be well used for detecting the orthogonal component of the compressed light after therelative phase between the compressed light and the local light is locked.