The invention discloses a quantitative explosive feeding device which comprises a constant volume tube (2), an upper gate disc (7), a lower grate disc (9) and a uniform explosive distribution tube (1), wherein the upper gate disc (7) which is used for opening or closing the upper end of the constant volume tube is arranged between the upper end of the constant volume tube (2) and a hopper (5), the lower gate disc (9) which is used for closing or opening the lower end of the constant volume tube is arranged at the lower end of the constant volume tube, the uniform explosive distribution tube (1) is arranged below the lower gate disc, an orifice at the upper end of the uniform explosive distribution tube corresponds to an orifice at the lower end of the constant volume tube, and an orifice at the lower end of the uniform explosive distribution tube corresponds to a paper tube. The quantitative explosive feeding device has the beneficial effects of uniform explosive distribution, accurate quantification, quick blanking and directional feeding, also has capabilities of avoiding explosive scattering, causing small explosive waste, improving explosive feeding efficiency and lowering production cost of firecrackers and fireworks, and is beneficial to environmental protection. The quantitative explosive feeding device has the advantages of compact structure and convenience for production and maintenance, and is applicable to massive explosive feeding of various types of firecracker and firework paper tubes with different sizes; and in addition, since the explosive feeding operation is carried out in a closed environment, the production is safe and has high reliability.