To solve the problems of the traditional manual lubrication of the open gear of miter gate hoist of a large single-stage ship lock，such as low efficiency and high consumption，this paper systematically analyzes the current situation of the operation characteristics，lubrication mode and lubrication film-forming effect of the miter gate hoist of the lock，and designs an external tanker type automatic lubrication system for the open gear combined with the research results of the comparison and selection of automatic lubrication modes. The practical application shows that the open gear automatic lubrication system can reliably realize the automatic lubrication of the open gear of the miter gate hoist and precise quantitative oil supplly，thus improve the lubrication effect of the opening gear of the miter gate hoist and increase the service life of the equipment.