The invention relates to a sleeve, in particular to a filtering sleeve. The filtering sleeve integrates filtering and conveying functions, and has good sealing property and a simple structure. The filtering sleeve comprises a sleeve body, a sleeve cap, a filtering core, a clamping sleeve nut and a clamping sleeve, wherein a cross-shaped groove is formed in the bottom of the filtering core, the sleeve body is provided with an inner cavity the shape of which is matched with the exterior outline of the filtering core, the filtering core is arranged in the inner cavity, the head part of the sleeve cap is in threaded connection with the inner cavity and pushes against the filtering core, a clamping sleeve joint is arranged at the head part of the sleeve body and is connected with the clamping sleeve in a clamping manner, and the clamping sleeve nut and the clamping sleeve joint are in threaded connection. According to the filtering sleeve, a filter is not independently installed, and the filtering core is arranged in the sleeve body, so that the sealing property of the whole structure is enhanced and liquid leakage is avoided; the filtering core is provided with the cross-shaped groove for reducing resistance of liquid in the filtering core and making the liquid be conveyed smoothly; and the whole filtering sleeve is made of a food-grade stainless steel, cannot be aged easily and cannot influence the quality of the conveyed liquid.