The present invention relates to a kind of water cultivating nutrient solution for cyclamen and its preparation process. The nutrient solution contains N, P, K, Ca, Mg, B, Mn, Zn, Cu, Mo and Fe separately in 166-176mg / L, 45-55mg / L, 250-260mg / L, 300-500mg / L, 30-38mg / L, 0.5-1.51mg / L, 0.2-0.8mg / L, 0.2-0.8mg / L, 0.01-0.03mg / L, 0.008-0.015mg / L and 4.0-4.5mg / L, and has pH 5.5-6.0. Its preparation process includes the steps of: weighing trace element compounds and dissolving in water to compound concentrated solution, dissolving Ca(NO3)2.4H2O and CaCl2 in water, dissolving the mixture NH4NO3, KNO3, KH2PO4 and MgSO4.7H2O in water, mixing, regulating pH value with dilute H2SO4 solution and NaOH solution to 5.5-6.0. The nutrient solution can make cyclamen adapt water cultivating environment in one week.