The invention discloses a multipurpose small rectification system for a laboratory. The multipurpose small rectification system comprises a feeding device and a rectification tower connected to the feeding device in series. The top of the rectification tower is orderly connected to a condenser and a return tank. A liquid outlet end of the return tank is connected to two pipes, one of the two pipes is provided with a return pump, has a liquid outlet end connected to the top of the rectification tower and is a return pipe, and the other one of the two pipes is connected to a top material tank and is a product pipe. A material outlet at the tower bottom is orderly connected to a bottom material pump and a bottom material tank by pipes. The rectification tower comprises a tower bottom, a tower body and the top of the tower. The tower bottom is connected to the bottom end of the tower body. The top of the tower is connected to the top end of the tower body. The tower body comprises multiple tower sections, each two adjacent tower sections are detachably connected by a connection section, and each one of the tower sections is filled with a filling material. The multipurpose small rectification system can realize industrial production-simulative continuous rectification in a limited space of a laboratory, can carry out a normal-pressure vacuum rectification test, a common continuous rectification test and an extraction rectification test and satisfies requirements on a plurality of tests in the laboratory.