The utility model provides a miniature plate type rectifying device, which comprises an overhead tank, a rectifying tower, a heat-insulating hood, a tower kettle, a storage unit, a cooler, a liquid distributor and a complete condenser. The miniature plate type rectifying device is characterized in that the tower kettle comprises a kettle body and a kettle cover. The miniature plate type rectifying device has the following characteristics: (1) the heating way is changed into an in-kettle heating way, so that the operation is safe, the heating voltage is adjusted in place through one step, a tower bottom product can be obtained through continuous operation, and the service life of the tower kettle is prolonged; (2) the heat-insulating way is changed into an air heat-insulating way, so that the appearance is tidy, the state in a tower is integrally visible, and the operation cost is not consumed; (3) an overflow pipe is changed into a transparent adjustable glass pipe, the welding is dispensed, the inside of the transparent adjustable glass pipe is visible, and the convenience is brought to the research of two-phase flowage; and (4), the tower plate fixing way is changed, the device is formed into building block type connection, therefore, the device is more convenient to disassemble and assemble, a separating effective area is not occupied, and the improvement of plate efficiency is beneficial.