The invention discloses a luminescent material Cu2(etmp)4 and a synthesizing method thereof. The molecular formula of the luminescent material Cu2(etmp)4 is C44H44Cu2N16O8. The molecular weight of the luminescent material Cu2(etmp)4 is 1052.05. Hetmp is 3-ethoxysalicylaldehyde-4-amino-1,2,4-triazole Schiff base. According to the synthesizing method, 0.056-0.112 g of analytically pure 3-ethoxysalicylaldehyde-4-amino-1,2,4-triazole Schiff base and 0.040-0.080 g of analytically pure cupric acetate are mixed and dissolved in 5-10 mL of analytically pure N,N-dimethylformamide solution, stirring is conducted for 20 min, then 5-10 mL of analytically pure acetonitrile is added, stirring is conducted for another 20 min, and then the mixture stands for three days at room temperature to generate Cu2(etmp)4. Cu2(etmp)4 generates 465 nm fluorescent light with the strength of 153.3 a.u.under the irradiation of 301 nm incident light, and generates stable light with the strength of 850 a.u.in a potassium peroxodisulfate solution under the three times of amplification coefficient of a 900 V photomultiplier. The technology is simple, cost is low, chemical components are easy to control, and repeatability and yield are high.