Abstract: The present invention relates to a disassemblable and washable primary surface heat exchanger, and more particularly, to a disassemblable and washable primary surface heat exchanger which includes a plurality of heat exchange cells disassemblably mounted inside an openable housing and having primary surface plates to thereby be easily maintained and repaired and to provide economic feasibility and thermal efficiency. Disclosed therein is a disassemblable and washable primary surface heat exchanger including: heat exchange cells, each of which includes: a first heat exchange plate; a second heat exchange; and supporting means; and a housing.