Flat plate type thyristor

The utility model provides a flat plate type thyristor, which belongs to the technical field of thyristors and comprises an upper lantern ring, a lower lantern ring, a cathode block, a thyristor chip and an anode block, the upper lantern ring and the lower lantern ring are connected and sleeved outside the cathode block, the thyristor chip and the anode block, and the upper lantern ring, the cathode block, the thyristor chip, the anode block and the lower lantern ring are sequentially abutted against each other. The cathode block is sleeved with a positioning ring, the positioning ring has a positioning effect on the cathode block, at least two first protruding blocks are arranged on the inner wall of the lower lantern ring, the circumferential outer wall of the positioning ring abuts against the first protruding blocks, and the positioning ring and the first protruding blocks are in tight fit for limiting; according to the utility model, the positioning ring is limited in the lower lantern ring through the f