Abstract: The device according to the invention is intended for making single-crystal products by the vertically-directed crystallization of molten metal on a seed and comprises a ceramic mould with a seed pocket in the bottom and a cooler with a flat face surface, installed under the mould and having an axial hole for accommodating the seed cooling unit interacting with the seed pocket and, according to the invention, installed with a provision for independent vertical movement relative to the cooler and seed pocket and made in the form of a tube embracing the seed pocket, said tube having an internal partition which divides the tube space into two compartments the lower of which is supplied with refrigerant and is made of a metal whose thermal conductivity ensures a maximum temperature gradient along the length of the seed for the initiation of a crystal.