A Florida woman built two dozen pipe bombs, packed with nails and pellets, and had amassed an “astonishing” amount of weapons — all with the “intention of hurting people,” authorities said Friday.

Michelle Kolts, 27, was arrested by Hillsborough County sheriff’s officers Thursday night after the woman’s parents stumbled upon the bombs in their home just outside Tampa Bay, according to authorities.

Officers also found more than 20 different knives, multiple BB guns and hunting bows — as well as dozens of books and DVDs on mass shootings, terrorism and bomb-making, cops said.

Kolts was “consumed with the Columbine killings” along with other mass murders, Sheriff Chad Chronister said in a press conference Friday morning.

The homemade bombs weren’t finished but they could be made lethal in under a minute after adding the fuse and powder, according to authorities.

Kolts had left some sort of “generic” written threats but they did not list specific targets, according to Chronister.

The sheriff said the Wimauma woman’s cache of weapons “could have caused catastrophic damage to hundreds if not thousands of people.”

“She planned to use them to hurt people,” Chronister said. “Who knows the amount of harm that could have been done … if these parents had not called the sheriff’s department for help.”

Authorities were previously warned about Kolts last year by a book publisher who reported the radical readings the woman had bought.

The sheriff said Kolts was ruled not a threat at the time, though. Her parents told authorities their adult daughter was on the autism spectrum, Chronister said.

Kolts is facing 24 counts of making a destructive device with intent to harm, authorities said.