Can the newly discovered blackhole (NR6819) suck Earth in the future?

If memory serves, that black hole is a thousand light years away. That 's pretty far -- 5,874,589,152,000,000 miles or 9,454,240,512,000,000 kilometers. I think it's safe to say that you can breathe easy.

In 15-18 billion years, sure. But by then the Earth will have been swallowed by our sun, which will expand to a red giant in about 7 billion years.

If you mean HR 6819, it is part of a stable star system 1,000 light years from Earth. It can't suck the Earth since its not anywhere near us and is not heading towards us.

While it's possible, it is very, very far into the future.  1000 light years is "close" in terms of how close objects are in the galaxy - but it's still very far away...  Both the newly discovered black hole and our solar system are orbiting the center of the Milky Way - so we're not moving very fast toward or away from each other. Just like the stars that have been our 'neighbors' for a very long time. 

no, what, why would you think that?

On balance , I think the answer is No .

One could imagine that over eons of time , the  black hole at the centre of our galaxy should probably consume every star in it -- but I suspect that their  orbital motions ,and interactions with one another ,and even the black hole itself, will keep most stars "safe" .

But it would be interesting to know if that calculation had ever been made . 

PS: I forgot -- Ref NR 6819 -- No .

We'll be absorbed into the sun many billions of years before that.