Nearly half of the 1,500 eight to 15-year-olds questioned in the People and Nature Survey said the virus had resulted in an impact on their mental health and wellbeing.
Six in ten children reported spending less time outdoors since the start of coronavirus.
Just over 70 per cent of children from ethnic minority backgrounds said they spent less time outside, compared with 57 per cent of white children.
Also 73 per cent from households with an annual income below £17,000 spent less time outdoors, compared with 57 per cent from households with an annual income above £17,000.
Gardens and parks were the main places for connection with nature during lockdown.