The invention discloses an analog quantity transmission system and method of a hybrid power transmission control protection apparatus, relates to the technical field of an electric power system, and aims to find weak links of the hybrid power transmission system in time and improve safety operation of the power grid. The analog quantity transmission system of the hybrid power transmission control protection apparatus comprises an interface conversion apparatus, a photoelectric conversion apparatus, a conventional direct current unit, a flexible direct current unit and an RTDS modeling work station used for outputting alternating current analog quantity and direct current analog quantity, wherein the interface conversion apparatus is in signal connection with the RTDS modeling work station, the conventional direct current unit and the flexible direct current unit separately; and the photoelectric conversion apparatus is in signal connection with the RTDS modeling work station, the conventional direct current unit and the flexible direct current unit separately. The analog quantity transmission system and method of the hybrid power transmission control protection apparatus provided by the invention are used for the hybrid power transmission system comprising a conventional direct current system and a flexible direct current system.