Maintenance-free moisture absorber

The invention discloses a maintenance-free moisture absorber, related to the technical field of moisture absorbers. The moisture absorber comprises a moisture absorber body and a controller arranged outside the moisture absorber body; the moisture absorber body comprises a shell, a stainless steel mesh cover sleeved inside the shell and a heater arranged inside the stainless steel mesh cover; thestainless steel mesh cover comprises an outer mesh cover in the shape of a ring column and an inner mesh cover which is sleeved inside the outer mesh cover and has a ring column shape; a mesh cover interlayer is formed between the outer mesh cover and the inner mesh cover; the mesh cover interlayer is filled with a desiccant, an upper mesh cover for blocking the desiccant overflow is arranged above the mesh cover interlayer, and a moisture absorbing pipe is also arranged in the mesh cover interlayer; the moisture absorbing tube is spirally wound around the outside of the inner mesh cover and is in contact with the des