The invention provides a composite ice and snow melting agent, wherein water, one, two, three, four, five or six chemical industry raw materials of potassium formate, sodium formate, ammonium formate,calcium acetate, magnesium acetate, potassium acetate, ammonium acetate, sodium acetate, calcium chloride, magnesium chloride, calcium hypochlorite and urea, a water quality stabilizer, one, two, three, four or five chemical industry raw materials of sodium molybdate, polyaspartic acid, benzalkonium bromide, sodium citrate, sodium gluconate and like used as corrosion inhibitors, one, two, three,four or five fertilizers capable of promoting plant growth, potassium fulvate capable of improving granular structure of soil, sodium chloride for alleviating pavement thermal shock during melting ofice and snow, and an activator urea are combined to obtain various technical formulas according to respective attributes. According to the invention, the composite ice and snow melting agent is good in ice melting and snow removing effects, contains solids and liquids, and can be used at a temperature of 33 DEG C below zero or above, can reduce corrosion to metals and concrete and promote plant growth, can bleach, sterilize and disinfect water obtained after ice and snow melting and clean road surface, and is suitable for mechanized operation.