The utility model provides a heavy nut horizontal installation is with adjustable rotatory bracket, includes base, two bearing retainer and rotary mechanism, the system has two bar slot holes on the base, and two bearing retainer movable installation are in two bar slot holes, bearing retainer comprises bottom plate and both sides board rigid coupling, and the system has two mounting holes of being connected with two bar slot holes on the bottom plate, rotary mechanism comprises bearing and axle, and axle, one row of bearing of epaxial suit are adorned respectively admittedly to bearing retainer's both sides board top. Convenience, high efficiency and the safety of the installation of heavy nut can be realized to this bracket to can be used to the installation of the heavy nut of different specifications.