The invention discloses a grouting construction device for dam foundation construction. The device comprises a bottom box and a stirring box. The bottom box is in a rectangular box shape; a feeding hole is formed in a top plate of the bottom box; a slurry discharging pipe is arranged on one side of the bottom box; the outer end of the slurry discharge pipe is connected with a spray pipe; a spray head is arranged at the tail end of the spray pipe; a pressurizing mechanism for pushing the slurry to be discharged is arranged in the bottom box; the stirring box is longitudinally arranged on the bottom box; the stirring box is cylindrical; a water inlet pipe and a dry material feeding pipe are arranged at the top end of the stirring box respectively; a discharging pipe connected with the feeding hole is arranged at the bottom end of the dry material feeding pipe and the bottom end of the stirring box, a valve is arranged at the discharging pipe, a first motor is arranged on a top plate of the stirring box, a rotating shaft is coaxially arranged in the stirring box, the top end of the rotating shaft is in driving connection with the first motor, and a plurality of inner rods are circumferentially distributed at different heights on the rotating shaft and are horizontally arranged. Concrete is mixed more quickly and uniformly, a pipeline is not prone to being blocked, and grouting ismore convenient.