A ribbon microplate self-acting Q double cladded-fiber amplifier includes a laser diode with tail fibers, a collimating focus lens system and a microplate crystal along the light beam forward direction charactering that the side microplate crystal is a dual doped one filmed at either side, there are a Faraday isolator, a short focal distance focusing lens, a double cladded fiber, on which a V notch coupling system is set, among which, the tail-fiber laser diode emits lights illuminating the filmed double doped microplate crystals via the collimating focus system to generate self-acting Q pulse laser to enter into the Faraday isolator then enters into the fiber core via a short focus lens, the V notch coupling system couples the pump light into an inner clad of the double cladded fiber.