The utility model discloses a two tray two -stages let pressure stock, including the stock body, preceding tray, spring by depressor, back tray, let press and manage and the nut, two tray two -stages let pressure stock is equipped with two trays at stock body facial make -up, and install the spring between preceding tray and the back tray and by the depressor, install between back tray and the nut to let and press the pipe, the spring is by the long 150mm of depressor, lets pressure scope 0 -110mm, let and press pipe range 80mm, let pressure scope 0 -40mm, let and press pipe inner wall diameter than the big 4mm of stock body diameter, let and press pipe diameter of the outer wall ratio let to press the big 4mm of pipe inner wall diameter, so, constitute a two tray two -stages let pressure stock. Treat tunnel excavation back, this two tray two -stages let pressure stock of installation, when the country rock took place to warp, the compressing deformation took place earlier by the depressor for the spring to satisfy the large deformation at country rock initial stage, and the relief presses the pipe compressing deformation to satisfy the little deformation behind the stability of surrounding rock, and then realize that the two -stage lets the effect of pressing the protection stock to avoid breaking, have that the installation is convenient, simple and practical's characteristics.