Grouting device free of unplugging

The utility model provides an unplugging-free mud jacking device which comprises a mud jacking pipe, a telescopic piece and an extension pipe, at least two fixing blocks are symmetrically arranged on the outer wall of the mud jacking pipe, at least two second fixing blocks are symmetrically arranged on the outer wall of the extension pipe, the telescopic piece comprises fixing rods installed at the upper ends of the second fixing blocks, and the fixing rods are connected with the telescopic piece. The end, away from the second fixing block, of the fixing rod penetrates through the fixing blocks, a limiting block is arranged at the upper end of the fixing rod, a spring is arranged on the outer wall of the fixing rod in a surrounding mode, a sealing ring is arranged between the outer wall of the extension pipe and the inner wall of the grouting pipe, and a one-way check valve and an opening-free plug are detachably installed at the lower end of the extension pipe. According to the device, plug opening and mud j