Underground diaphragm wall toe post-grouting construction device

The utility model relates to the technical field of grouting construction, in particular to an underground diaphragm wall toe post-grouting construction device which comprises a grouting machine, a discharging pipe is fixedly connected in a discharging hole in the bottom of the grouting machine, a conveying pipe is placed at one end of the discharging pipe, and an arc-shaped fixing plate and an arc-shaped mounting plate are arranged at the joint of the discharging pipe and the conveying pipe. The arc-shaped fixing plate corresponds to the arc-shaped mounting plate in position, and a fixing mechanism is mounted on the arc-shaped fixing plate and the arc-shaped mounting plate; the inserting blocks on the fixing blocks can be inserted into the mounting grooves in the mounting blocks, the mounting rods are pulled outwards to be separated from the limiting holes in the inserting rods, the reset springs drive the inserting rods to move downwards to penetrate through the fixing grooves of one inserting block and ext