Hand hole blocker for vertical type steam generator of nuclear power station

The invention discloses a hand hole blocker for a vertical type steam generator of a nuclear power station. The hand hole blocker comprises a hollow ball shaft base, and a ball shaft which can move inthe ball shaft base up, down, left and right, wherein one side of the ball shaft base is connected and equipped with a stud through threads; the ball shaft is mounted at the other side, opposite to the stud, of the ball shaft base; a connecting rod which is fixedly connected to the ball shaft, a connecting plate fixedly connected onto the connecting rod, and a blocker, which is fixedly connectedto one end, away from the connecting rod, of the connecting plate, are sequentially arranged on the ball shaft. Compared with the prior art, the hand hole blocker for the vertical type steam generatorof the nuclear power station disclosed by the invention has the advantages of being strong in adjustable property, small in weight, convenient to mount, free of a special tool, and capable of guaranteeing isolation of a descen