The invention provides an oxygen bottom blowing gun base. The oxygen bottom blowing gun base comprises a cooling device; an oxygen gun hole which penetrates through in the axial direction is defined in the cooling device; a cavity which extends in the axial direction is defined in the side wall of the cooling device; a separation plate is arranged in the cavity in the axial direction for dividing the cavity into an inner channel and an outer channel; a through hole which communicates the inner channel with the outer channel is formed above the separation plate; a refrigerant inlet which communicates with the inner channel and a refrigerant outlet which communicates with the outer channel are formed in the bottom end of the side wall of the cooling device; and a refractory brick protective cover sleeves the outer periphery wall of the cooling device. The oxygen bottom blowing gun base can effectively protect an oxygen gun, prolongs the service life of the oxygen gun, reduces the gun change times, and improves the operation efficiency.