The invention discloses a reflecting mirror based condensed light transmission device which comprises a reflecting mirror assembly, a mirror assembly direction adjustment system, a photoelectric plate and a hydraulic motor, wherein the hydraulic motor is composed of a hydraulic motor outer stator and a hydraulic motor inner rotor; the reflecting mirror assembly comprises a plurality of regular hexagonal plane mirrors for reflection, each plane mirror is arranged along a track of a paraboloid, and a paraboloidal structure is formed; the mirror assembly direction adjustment system comprises fixed connection rods and an oil cylinder telescopic connection rod, and a convex surface of the reflecting mirror assembly is connected with the hydraulic motor outer stator by a plurality of fixed connection rods and the oil cylinder telescopic connection rod; the photoelectric plate is fixed on a concave surface of the reflecting mirror assembly by a plurality of connection rods; a plurality of support stands are arranged at the bottom of the hydraulic motor inner rotor; and a black box is arranged on the photoelectric plate. According to an implementation of the condensed light transmission device, the angle of the reflecting mirror assembly is adjusted timely by an analog quantity input/output (I/O) device so as to collect solar reflected light to the maximum extent, the intelligent control degree is improved, material caring by manual is substantially reduced, and thus, renewable low-cost electric energy is acquired.