The invention relates to a slurry shield stone collecting device. The device comprises a box body, a slurry inlet pipe, a tapered grid, a receiving part, guiding plates and a first slurry discharging pipe. The slurry inlet pipe is communicated with the box body through a first inlet. The bottom end of the tapered grid is mounted on the opening portion of the receiving part, the top end of the tapered grid faces toward the top of the box body, both the tapered grid and the receiving part are located in the box body, and gaps are formed between both the tapered grid and the receiving part and the inner side wall of the box body. The guiding plates are arranged on the periphery of the inner side wall of the box body, the guiding plates are located below the first inlet, the guiding plates are used for guiding slurry to the tapered grid, and a gap is formed between the guiding plates and the tapered grid. One end of the first slurry discharging pipe penetrates a first outlet, extends into the box body and is communicated with the receiving part, and the other end of the first slurry discharging pipe is used for being communicated with a suction pump. According to the slurry shield stone collecting device, it is easy to isolate big stones, it is unlikely to block the grid, and cleaning workload can be relieved.