The invention belongs to the field of metal anticorrosion, and particularly relates to a hot-dipping zinc-aluminum-calcium alloy coating and a hot-dipping method thereof. The zinc-aluminum-calcium alloy coating is prepared from the following components of, by mass, 12%-15% of aluminum, 1.0-1.3% of calcium, and the balance being zinc and inevitable impurities. The hot-dipping method comprises the following steps of adding the weighed zinc and a zinc-aluminum intermediate alloy into a smelting furnace, and heating the mixture to 505-510 DEG C; adding an aluminum-calcium intermediate alloy into the smelting furnace after melting is completed, and heating the mixture to 615-620 DEG C; and reducing the temperature to a hot-dipping temperature of 510-520 DEG C after melting is completed. According to the hot-dipping zinc-aluminum-calcium alloy coating and the hot-dipping method thereof, the added calcium is separately combined with Zn and Al to separate out fine Al-Ca or Zn-Ca second phase particles, and when zinc-aluminum-calcium alloy is solidified, the fine particles serve as crystal nuclei, so that the crystal grains of the zinc-aluminum-calcium alloy are refined, and the corrosion resistance is improved.