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42.3%和3.3％。 To improve the grafting rate of 2JSZ-600 vegetable grafting machine and the survival ratio of vegetable seedling grafted，a high-speed vegetable grafting machine with double manipulators was developed based on the essential structure of the old machine with a set of manipulators for transporting stock and scion added and the geometrical parameter of cutting mechanism optimized. The key structural parameters were determined by mechanism analysis and experiment. The cutting effects of stock and scion were best when angular velocity of cutter was 210r/min. The experimental results indicate that the average grafting rate of the machine is 854 seedlings per hour and the survival ratio is 93.3％, compared with the old machine, under the condition of the same grafting success rate and adaptability to seedlings. The grafting rate and the survival ratio are increased respectively 42.3% and 3.3％.