The invention provides a muddy
water extraction device. The muddy
water extraction device comprises a sleeve, a base connected with one end of the sleeve, a cover plate and a limiting stop block; an
open hole is formed in the base; the cover plate is used for covering the
open hole; the limiting stop block is used for limiting the rotating angle of the cover plate; and the
open hole communicates with the sleeve, and the cover plate is hinged to the side face, facing the sleeve, of the base. The open hole is formed in the base, and when the sleeve extends into a
drill hole, muddy water at the bottom of the hole pushes open the cover plate under the action of pressure and enters the sleeve through the open hole; and in the ascending process of the sleeve, the cover plate can be tightly pressed on the open hole under the action of the gravity of the limiting check block and the pressure of muddy water, so that the open hole is covered, and
water leakage is prevented. The rotation angle of the cover plate can be limited through the limiting stop block, and the situation that resetting cannot be achieved due to excessive rotation is avoided. Therefore, through the muddy
water extraction device, rapid extraction of the muddy water at the bottom of the hole can be achieved, an operator can conveniently and comprehensively judge the defects of the bottom of a
pile through a camera device, and the influence degree on the camera device is small.