Scale inhibition alloy, preparation method thereof and scale inhibition sheet made of scale inhibition alloy

The invention relates to a scale inhibition alloy, a preparation method thereof and a scale inhibition sheet made of the scale inhibition alloy. The scale inhibition alloy comprises the following components of 45 wt%-60 wt% of Cu, 15 wt%-25 wt% of Zn, 10 wt%-25 wt% of Ni, 3 wt%-10 wt% of Sn, 1 wt%-10 wt% of Bi, 0.05 wt%-1 wt% of Fe, 0.1 wt%-0.5 wt% of Mn and the balance impurities, and the total content of the impurities is smaller than or equal to 0.1 wt%. No toxic elements such as Pb, Sb and As are added into the scale-inhibiting alloy, so that the scale-inhibiting alloy is healthy and environmentally friendly; and expensive elements such as Ag and rare earth are not added, so that the cost is relatively low. The free Bi element with high electronegativity is added into the scale inhibition alloy, the Bi element and the Zn element form potential difference to excite activation current, and Bi greatly improves the cutting machining performance of the alloy. The scale inhibition alloy can stably release 70-90