The invention relates to the technical field of steel bar connecting structures, and discloses a steel bar connecting structure of a prefabricated cement component. The steel bar connecting structurecomprises a bottom plate; a plurality of evenly distributed first sleeves are fixedly arranged at the upper end of the bottom plate; the openings of the first sleeve are upward; certain sides of the plurality of first sleeves are provided with first threaded holes; a first fastening bolt is in threaded connection to the interior of each of the plurality of first threaded holes; a steel bar is sheathed in the interior of each of the plurality of first sleeves; the ends, located in the interiors of the first sleeves, of the plurality of steel bars are fixedly connected to the first sleeves by means of the first fastening bolts; the side wall of each of the plurality of steel bars is in fixed cup joint with two symmetrically-arranged ring-shaped connection blocks; the upper end of each ring-shaped connection block is provided with four symmetrically-distributed mounting holes. The steel bar connecting structure of the prefabricated cement component can effectively strengthen the connection of the plurality of steel bars, so as to improve the holding power of the steel bars and improve the reinforcing effect of the steel bars on the strength of the cement component, and can be easily used by people.