The invention relates to an auxiliary steelmaking material, in particular to an environment-friendly material and a preparing method thereof. The environment-friendly material is characterized in that a submerged arc heat accumulation agent comprises, by weight, 63-71 parts of limestone, 8-16 parts of magnesite, 7-9 parts of light calcined magnesia, 1-5 parts of barium carbonate, 1-5 parts of metallic aluminum, 1-3 parts of silicon carbide, 0.5-1.5 parts of metallic silicon and 3.5-4.5 parts of water. Material decomposition is achieved at the high temperature, gas is continuously generated under the condition that 0.7-1.0 Kg / ton of steel is added, slag liquid is foamed, the slag liquid is emulsified in the gas-slag mixing state, the slag liquid level rises, and electrode arc light is continuously and more effectively embedded. In the steel refining process, the purposes that the extremely high noise generated by electrode arcing in an LF furnace is lowered, the noise in an operation room of the LF furnace is reduced to 74-85 decibels from 87-97 decibels, and the environment-friendly steel making is achieved are achieved.