The invention provides a concrete slurry conveying device which comprises a conveying pipe (10) and a first flange (20). The conveying pipe (10) comprises an inlet section (12), a middle section (14) and an outlet section (16). The end portion of the first flange (20) and the inlet section (12) are welded to form a first welding line (26). A first quenching section (121) with the uneven thickness placed on the inlet section (12) and a second quenching section (141) with the even thickness placed on the middle section (14) are arranged on the inner wall of the conveying pipe (10). The thickness of the portion, opposite to the first welding line (26), of the first quenching section (121) is equal to the minimum thickness of the first quenching section (121). According to the concrete slurry conveying device, the inlet section (12), which can be easily abraded, of the conveying pipe (10) is subjected to special quenching treatment, so that different quenching layer thicknesses are obtained, the wear-resisting property and the anti-detonating quality of the conveying pipe (10) are integrated, and product service life is effectively prolonged.