A high-speed seedling transplanting machine, a high-speed seedling feeding method and a high-speed seedling transplanting method, the high-speed seedling transplanting machine comprising a vehicle body (10), a seedling transplanting device (30) and a conveying device (20), wherein the vehicle body (10) is driven to run; the seedling transplanting device (30) comprises a seedling carrying platform (31) and at least one seedling transplanting assembly (32); each of the seedling transplanting assemblies (32) is driven to transplant each seedling from the seedling carrying platform (31) into soil; the conveying device (20) is driven to convey a seedling to the seedling carrying platform (31); the conveying device (20) comprises a seedling containing tray (21) and a seedling feeding portion (22A, 22B), wherein the seedling containing tray (21) carries at least two seedlings, and the seedling feeding portion (22A, 22B) transfers the seedlings to the seedling carrying platform (31).
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