Built-in glaucoma drainage valve

The invention relates to a built-in glaucoma drainage valve. The valve comprises an outer drainage tube, an inner drainage tube, an elastic valve block and a limiting block. The outer drainage tube, the elastic valve block, the inner drainage tube and the limiting block are detachably connected in a sleeved mode to form a drainage channel capable of being opened and closed; the inner drainage tubecomprises a drainage part and a mounting part; the elastic valve block comprises an elastic piece valve and a fixed part; the end face of the drainage part is matched with the elastic piece valve; the limiting block is used for limiting and supporting the elastic valve block, so that the elastic piece valve moves relative to the fixed part after being stressed, and opening and closing of the drainage channel are achieved; and a fixed pin is arranged at one end of the outer drainage tube, so that interlayer fixation of sclera is facilitated. The drainage valve has the advantages that differentvalves can be adapted acc