The utility model belongs to the technical field of agricultural machine, in particular to prevent smart volume seed metering ware of slope spoon formula maize. Seed metering ware casing (1) is equipped with square board (15), adjusting plate (11) and seed metering mouth (13), seed metering ware apron 2 is equipped with into kind of mouth (21), unloads kind of a mouth (26), guide slot (24), two first tongue (25) and second tongue (22), seed metering dish (3) outer fringe circumference uniform interval is distributing a plurality of circular ports (35), is connecting a spherical's the spoon body on the surface at every circular port (35), and the semi -closed space that they formed with baffle (4) of hugging closely seed metering dish (3) is called holds kind of a spoon (31), runner (6) ring top outer fringe circumference distributing a plurality of glossy profiles of tooth protruding (61). The utility model discloses can reduce the influence of slope to the seed metering performance to effectually the kind has been avoided knocking, clear away unnecessary seed better, make the seed metering utensil have good single seed nature, kind of a space is held in the increase, improves and fills kind of a performance.