The utility model discloses an asynchronous interconnection back -to -back converter substation bilayer framework of being qualified for next round of competitions. It includes framework post, lightning -arrest terminal, and lattice formula intercolumniation supports, lattice formula intercolumniation supports to set up and strides between the framework post in two adjacent height, form by roof beam chord member and web member by the frame girder, be qualified for the next round of competitions hang the point set up in the roof beam chord member outside, have the suspension insulator hoisting point set up in in the middle of the web member, have the height stride the frame girder set up in framework post upper end is striden to the height, low stride the frame girder set up in low stride framework post upper end, height stride the post on the low span beam installation base, lightning -arrest terminal upper end is provided with the overhead ground wire and hangs the point, the frame girder with low stride the framework post it is articulated that the framework post is striden to the height, the frame girder the framework post lattice formula intercolumniation supports and forms a the stress system jointly. Overcome current individual layer be qualified for the next round of competitions framework area big, be unfavorable for electricly arranging, cubic metre of earth and stone expense is high, body steel construction quantity is big shortcoming.