A rotary lock block type drilling riser connector, including a main body connection part and control pipeline connection parts, the structure of main body connection part is: a driving ring is set between the flanges of an upper and a lower joint, a plurality of fan-shaped grooves are set on the lower end of the flange of the upper joint, each fan-shaped groove having a lock block (6) therein, the driving ring (4) surrounds outer sides of all the lock blocks, matching crimping circular grooves are arranged for each lock block and the lower joint; each lock block is slidably connected with a T-shaped elongated slot of the upper joint through a T-shaped screw; the driving ring is fixedly connected with the flange upwardly, many segments of the horizontal T-shaped slots are evenly distributed in the inner surface of the driving ring along a circumference direction, another screw hole is provided in the outer circumferential surface of the lock block, and the driving ring is slidably connected with the lock block in the circumferential direction by a T-shaped screw. The connector is simple in structure and convenient to operation.