Horizontal truss easy to install on attached lifting operation safety protection platform

The utility model discloses a horizontal truss easy to install on an attached type lifting operation safety protection platform, which comprises a connecting piece (1), an annular limiting piece (2) and two horizontal supporting rods (3), two opposite side walls of the connecting piece (1) are provided with first grooves (10), two opposite inner walls of the first grooves (10) incline from an opening to the bottom, and the two horizontal supporting rods (3) are arranged in the first grooves (10). A first groove (10) is formed in the connecting piece (1), a second groove (11) is formed in the bottom of the first groove (10), a stress plate (12) is arranged on the connecting piece (1), a limiting block (20) capable of vertically sliding up and down is arranged on the limiting piece (2), the limiting piece (2) is detachably connected with the stress plate (12) through a bolt (4), a nut (5) and a threaded hole (21) in the stress plate (12), and one end of the horizontal supporting rod (3) penetrates through the l