The invention discloses a liquid Bunsen burner which comprises a nozzle, a mixing tube and a lamp holder. The nozzle, the mixing tube and the lamp holder are sequentially connected. The nozzle comprises an inner air tube, a liquid tube and an outer air tube, wherein the inner air tube, the liquid tube and the outer air tube are coaxially installed, the inner air tube is located on an inner ring and used for spraying air or combustion-supporting gas, the liquid tube is located on a middle ring and used for spraying liquid, and the outer air tube is located on an outer ring and used for spraying air. The mixing tube is a U-shaped tube and is gradually expanded from one end to the other end. The lamp holder is a conical tube with the bottom diameter equal to the diameter of the mixing tube. A burner port for burning liquid is formed in an opening of the conical tube of the lamp holder. According to the liquid Bunsen burner, stabilized atomization of liquid fuel is achieved under the situation that the pressure of the liquid fuel and the pressure of feeding air are slightly higher than atmospheric pressure, the cost of the design of the whole liquid Bunsen burner is small compared with other experimental facilities, the amount of the required fuel for the experiment is only about 10 ml, the experimental expense is reduced, and the flame propagation velocity is conveniently measured.