Earth will not fall into a black hole because no black hole is close enough to the solar system for Earth to do that. Even if a black hole the same mass as the sun were to take the place of the sun, Earth still would not fall in. The black hole would have the same gravity as the sun.

The idea of a black hole 'sucking in' a nearby star sounds like science fiction. But this is exactly what happens in a tidal disruption event. 

Astronomers know what should happen in theory. "When an unlucky star wanders too close to a supermassive black hole in the centre of a galaxy, the extreme gravitational pull of the black hole shreds the star into thin streams of material. "They also says that "when a black hole devours a star, it can launch a powerful blast of material outwards that obstructs our view" they added.

What is Black Hole

A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because no light can get out, people can't see black holes. They are invisible. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently than other stars.

Black holes are one of the most powerful forces in the universe, swallowing up everything in their wake. Supermassive black holes, meanwhile, can be billions of times the size of our sun, according to study, and lie at the center of most galaxies, including our own Milky Way. And so long as we remain in our current stable orbit around it.

Astronaut says, we run no risk of falling in. However, he does note that if our orbit were to be thrown off, it could send us on a collision course with the universal equivalent of a Dyson vacuum.

So, while any black hole could easily disintegrate Earth and humanity if we came close enough, the odds that this will happen anytime remotely soon are very low, and should not be worried about that day.