The invention discloses a roadside support method for a tight roof constant-resistance yielding roadway. A support device comprises a plurality of units of a split structure. Each unit comprises two parts of a constant-resistance yielding pad and a filler which are combined for use, wherein the constant-resistance yielding pad is an outer injection type single-body hydraulic supporting pillar which is provided with a short and thick plunger and of a deformation structure and is installed above the filler, and the sum of the highest lifting height of the constant-resistance yielding pad and the height of the filler is equal to the initial height of the roadway. Preset deformation control is carried out over a roof through the constant-resistance characteristic of the constant-resistance yielding pad; the roof is taken out in time when sinking to the compression limit of the constant-resistance yielding pad, and the filler is used for carrying out limiting deformation control over the roof. The roadside support method for the tight roof constant-resistance yielding roadway has the advantages of being good in adaptation deformation capacity, good in roadway forming performance, easy to operate, low in supporting cost, good in roadway safety and the like, and is particularly suitable for roadside support of the roadway with the tight roof in the gob-side entry retaining process.