Formaldehyde　(HCHO)　has　been　identified　as　one　of　the　most　common　indoor　pollutions　nowadays.　Manganese　oxides　(MnOx)　are　considered　to　be　a　promising　catalytic　material　used　in　indoor　HCHO　oxidation　removal　due　to　their　high　catalytic　activity,　low-cost,　and　environmentally　friendly.　In　this　paper,　the　progress　in　developing　MnOx-based　catalysts　for　HCHO　removal　is　comprehensively　reviewed　for　exploring　the　mechanisms　of　catalytic　oxidation　and　catalytic　deactivation.　The　catalytic　oxidation　mechanisms　based　on　three　typical　theory　models　(Mars-van-Krevelen,　Eley-Rideal　and　Langmuir-Hinshelwood)　are　discussed　and　summarized.　Furthermore,　the　research　status　of　catalytic　deactivation,　catalysts＇　regeneration　and　integrated　application　of　MnOx-based　catalysts　for　indoor　HCHO　removal　are　detailed　in　the　review.　Finally,　the　technical　challenges　in　developing　MnOx-based　catalysts　for　indoor　HCHO　removal　are　analyzed　and　the　possible　research　direction　is　also　proposed　for　overcoming　the　challenges　toward　practical　application　of　such　catalysts.　(c)　2022　Institute　of　Process　Engineering,　Chinese　Academy　of　Sciences.　Publishing　services　by　Elsevier　B.V.　on　behalf　of　KeAi　Communications　Co.,　Ltd.　This　is　an　open　access　article　under　the　CC　BY-NC-ND　license　(http://creativecommons.org/licenses/by-nc-nd/4.0/).