The trenching, fertilizing and backfilling machine is driven by the rear output of the tractor, driving the carriage chain to transport fertilizer: trenching, fertilizing and backfilling are completed in a series, effectively solving the fertilization problem of fruit farmers: it is suitable for fertilization in various farmlands, orchards and other working environments. The trenching depth of this product is adjustable from 25 to 35 cm. It can be used for farm manure and various organic fertilizers. One machine has multiple uses, saving time, effort and labor.