Continuous seedling tray downward-moving control mechanism capable of realizing convenient clamping and tray feeding continuity

The invention discloses a continuous seedling tray downward-moving control mechanism capable of realizing convenient clamping and tray feeding continuity.The continuous seedling tray downward-moving control mechanism comprises a mounting assembly and a step-by-step descending driving mechanism, wherein the mounting assembly comprises two downward-moving clamping pieces, the two downward-moving clamping pieces are arranged on the two vertical sides of a grid seedling tray respectively, mounting holes are formed in the two sides of each downward-moving clamping piece, and hanging rods are arranged in the mounting holes in the two sides of each downward-moving clamping piece in a penetrating mode; supporting holes are formed in the two vertical sides of the grid seedling tray, and the supporting holes are arranged on the hanging rods of the mounting holes in one side of the downward-moving clamping piece in a sleeving manner; and a guide assembly is arranged on a rack of a seedling sowing machine and comprises t