Modularized assembled sofa

The utility model discloses a modular assembly type sofa, which comprises a sofa seat, armrests and a backrest, at least one group of connecting holes are respectively arranged at the left side edge, the right side edge and the rear side edge of the bottom of the sofa seat, a connecting piece is arranged on each group of connecting holes, and each group of connecting holes comprises an inserting hole and a threaded hole. The connecting piece comprises a connecting plate and two inserting rods which are vertically and fixedly connected with the two sides of the connecting plate respectively, the inserting rods are matched and inserted with the inserting holes, mounting holes corresponding to the threaded holes are formed in the connecting plate, the connecting plate penetrates through the mounting holes and the threaded holes through screws to be fastened at the bottom of the sofa seat, and inserting holes are formed in the corresponding positions of the bottoms of the armrests and the backrest respectively. T