The invention discloses a semitransparent silicone sealant special for a copper product and a preparation method thereof. The semitransparent silicone sealant special for the copper product is prepared from HPDMS, hydrophobic silicon dioxide, a filler, a cross linking agent, a coupling agent, a catalyst and methyl silicone oil, the preparation method of the semitransparent silicone sealant comprises the following steps that 1, 100 parts by weight of HPDMS and 7-10 parts by weight of the cross linking agent are put into a reaction kettle; 2, the stirring speed of materials inside the reaction kettle is lowered, and 30 parts by weight of methyl silicone oil is added into the reaction kettle; 3, 8-10 parts by weight of hydrophobic silicon dioxide is added into the reaction kettle, and stirring is performed for 30 min; 4, 0.05 part by weight of the catalyst is added into the reaction kettle. Due to hydrophobicity of methyl silicone oil inside the hydrophobic silicon dioxide and compatibility of methyl silicone oil and HPDMS, the semitransparent silicone sealant special for the copper product has the excellent mechanical performance and the good water resistance.