A judge on Wednesday dismissed a carer's claim that a negative culture at the residential home she worked at led to her abusing at least 22 of the children there.

Chiu Wing-sin, 46, was one of 34 caregivers charged in connection with a spate of child abuse at the Children's Residential Home in Prince Edward three years ago.

She pleaded guilty to 49 counts of abuse, with the District Court told she hit children with a shoe and kicked them in the head.

As well as citing a negative culture at the home run by the Hong Kong Society for the Protection of Children, the defence said Chiu had been praised by parents and senior colleagues during her more than 20 years of experience in childcare and had suffered depression and suicidal thoughts following the abuse incidents.

However, judge Lily Wong rejected the mitigation plea and severely criticised Chiu for her actions, saying she "beat up the children every day she went to work".

The judge questioned why Chiu did not take action or resign from her position if she disagreed with the practices at the centre, instead of participating in the abuse.

The case was adjourned until September 20 for sentencing.