A man forced his stepson to drink hot sauce until he vomited and made him sleep in a locked closet in a horrific campaign of abuse, it is alleged.

Kevin Grant, 31, also allegedly made the boy kneel on tacks and hold a bottle rocket in his mouth until it exploded.

The boy's mother, Kaitlin Elizabeth Baptiste, 29, is accused of knowing her husband was abusing her son but doing nothing to stop it.

Authorities claim the boy was forced to sleep in a locked laundry room for four months and only allowed out by his stepdad when he wanted to use the toilet.

Kaitlin Elizabeth Baptiste, 29, is accused of knowing her husband was abusing her son and not stopping it

An arrest warrant states that on one occasion the boy, whose age has not been reported, was sick after eating too much spicy food but was forced to ingest his own vomit.

Police were called to the couple's home in New Haven, Connecticut, US, over a report of abuse, the Daily Mail reports.

The victim reportedly described an occasion where he was blamed for one of his siblings falling and injuring his head.

Grant allegedly beat the boy as punishment before making him stand in a corner of a room for a week.

The boy was allegedly made to drink hot sauce until he was sick (file photo)

The stepdad is also accused of forcing him to kneel on rice for a whole day and do push ups until he could no longer move his arms.

Grant has been charged with risk of injury to a child, second-degree assault, intentional cruelty, disorderly conduct and reckless endangerment.

Baptiste was charged with risk of injury to a child, reckless endangerment, conspiracy to commit intentional cruelty and conspiracy to commit disorderly conduct.

The pair were released after posting $25,000 and $10,000 bonds respectively and are expected to return to court on November 10.