The invention relates to gas and liquid, and relates to a multi-purpose compressor. The multi-purpose compressor utilizes a principle of a cylindrical linear motor to use electric energy to directly drive pistons; the modes that traditional plunger compressors drive the pistons to do reciprocating motion through crankshafts and connecting rods are substituted; intermediate transmission parts can be removed, and lubricating oil can be avoided; and therefore, noise can be relatively abated, the volume can be decreased, and maintenance costs and the risks of environment pollution can be reduced.