Shock absorber with retainer, for downhole tool

The invention discloses a shock absorber with a retainer, for a downhole tool. The shock absorber is mounted on a cutter mechanism at the bottom of a tool body of the downhole tool through the retainer, the shock absorber is a column body in which a cavity is formed, and the column body is provided with an upper end surface and a lower end surface; the retainer comprises a lower main body and an upper main body, the shock absorber sleeves the lower main body, and the upper main body is clamped on the lower main body to fix the shock absorber. The shock absorber disclosed by the invention comprises the shock absorber and the retainer, the shock absorber is mounted on the cutter mechanism at the bottom of the tool body of the downhole tool through the retainer, and the shock absorber can buffer the lower part of the downhole tool, so that the downhole tool can be well protected; the shock absorber is simple to mount and stable to work.