Disclosed is a half-heavy refractory brick for dry-quenching furnace annular air duct. The half-heavy refractory brick is produced from raw materials including, by weight, 16%-25% of mullite aggregates 5-3mm in particle size, 15%-30% of mullite aggregates smaller than 3-1mm in particle size, 5%-15% of mullite aggregates smaller than 0.074mm in particle size, 5%-15% of andalusite smaller than 1-0.074 in particle size, 10%-30% of fined mullite powder, 3%-10% of fined andalusite powder, 5%-20% of hollow spheres, 1%-8% of kaolin micro powder, 0.01%-2% of an interface treating agent and 2%-5% of a binding agent. The production method includes: firstly, mixing the hollow spheres with the interface treating agent; then adding the fined mullite powder, the fined andalusite powder and the kaolin micro powder; evenly mixing all of the mullite aggregates, the andalusite, the hollow spheres and the binding agent; pressing into a brick; drying; baking for standby use. By the arrangement, problems that the brick for the dry-quenching furnace annular air duct is prone to bloating and cracking are solved, compression strength of the brick can reach more than 60MPa, unit weight of the brick can be lowered more than 10%, and usage period is greatly prolonged.