The invention relates to the technical field of sewing machines, in particular to a feeding-needle adjusting mechanism of a sewing machine. The needle feeding adjusting mechanism comprises a swinging shaft installed in a sewing machine head and a feeding needle installed at the lower end of the swinging shaft. The upper end of the swinging shaft is adjustably installed on a swinging crank, the swinging crank is connected with the lower end of a swinging plate through a swinging crank pin, and the upper end of the swinging plate is hinged to a needle-rod puncturing head of the sewing machine. The feeding-needle adjusting mechanism has the advantages that the needle feeding mechanism is effectively simplified, assembling time is saved, an upper cover does not need to be disassembled when a feeding-needle journey is adjusted, and meanwhile it is guaranteed that the feeding needle and a machine needle of the sewing machine are synchronous.