The invention relates to a water adapter which comprises a body, wherein a cooling liquid channel is formed in the body. The water adapter is characterized in that a stainless steel filtering screen is fixed in the body through an elastic snap spring; the stainless steel filtering screen completely covers the longitudinal section of the cooling liquid channel at the fixed position of the stainless steel. The water adapter disclosed by the invention has the advantages that firstly, the stainless steel filtering screen is adopted for filtering cooling liquid, so that the water adapter is simple in process, good in breathability and uniform and stable in precision; secondly, the filtering screen is fixed by means of the snap spring, so the leakage is avoided, the regeneration speed is high, the convenience for mounting is realized, the service efficiency of the adapter is improved, and the service life is prolonged; thirdly, the pollution to a water body can be suppressed from the source of a water cooling reactor, and poor heat dissipation of a finished machine caused by blocking is prevented, so that the situation that the traditional water adapter has no filtering function is broken; fourthly, the simplicity for use, the safety and the reliability are realized, no structural space is added, and the defect that the existing water cooling reactor is blocked is greatly overcome, so that the utilization rate of the whole system is improved.