The micro heat absorption dryer is filled with adsorbent, activated alumina desiccant and molecular sieve (molecular sieve is generally 4A molecular sieve). Different specifications can be selected according to the working pressure of the equipment. The working pressure of the equipment is within 8 kg. Alumina can be used ￠3- 5mm, molecular sieve ￠3-5mm. The working pressure of the equipment is within 10 kg, alumina can choose ￠4-6mm, molecular sieve ￠3-5mm. The working pressure of the equipment is ￠5-8mm for alumina within 15 kg, and the molecular sieve specification is still ￠3-5mm. The filling must be slow and no gaps are left. The adsorbent regeneration temperature can be set above 150.