The invention discloses a deposition instrument for quantum dot sensitized thin-film solar cells. The deposition instrument based on a successive ionic layer adsorption and reaction method and an electrochemical deposition method comprises a base capable of automatically perpendicularly moving. Beakers horizontally rotate and move, so that the base can be soaked in different types of electrolyte solution or cleaning solution in the beakers or can be separated from the different types of electrolyte solution or cleaning solution in the beakers, a deposition voltage which varies along a time function can be outputted, semiconductor compound battery materials which respectively contain at least five elements can be grown by the aid of the deposition instrument, and contents and thicknesses of quantum dot thin-film adsorption layers of the various materials can be precisely controlled. The deposition instrument has the advantages of mobility, simple structure, small occupied space and capability of guaranteeing that a cathode and an anode or the glass base can be precisely positioned.