Soil ecosystems are one of the main sources of greenhouse gas emissions, hence, reducing soil greenhouse gas emissions is of great significance for alleviating global warming. In recent years, biochar has shown great potential in improving soil properties, enhancing soil carbon sinks and affecting soil greenhouse gas (GHG) emissions. Therefore, the study on the effect of biochar application on soil greenhouse gas emissions has become a research hotspot in the fields of environmental science and agroecology. However, there is no consensus on whether the effect of biochar on net GHG emissions from soil is promoting or suppressing. There are also great differences in soil GHG emissions from different vegetation types, so it is very important to study the effect of biochar addition on GHG emissions from different vegetation types. In this review, the effects of biochar addition on CO₂, CH₄ and N₂O emissions from forest land, farmland and facility vegetable soils were reviewed, and the mechanism of biochar effects on soil GHG emissions was discussed. It was concluded that the addition of biochar to soils of different vegetation types would reduce soil N₂O emissions and increase land absorption of CH₄, while there was no unified conclusion on the effects on CO₂ emissions. Combined with the research status of biochar in this field, it is necessary to carry out long-term systematic research in the field of soil GHG emission reduction in the future, which is aim to provide a reliable scientific basis for the application of biochar in soil GHG emission reduction.