The invention discloses composite aluminum powder for fireworks bursting charge. The composite aluminum powder comprises components in parts by weight as follows: 65-75 parts of aluminum powder, 17-21 parts of magnesium carbonate, 8-12 parts of ferric oxide and 0.5-1.5 parts of sodium bismuthate. The components are mixed uniformly with a common method. The fireworks bursting charge prepared from the aluminum powder does not contain sulfur and does not contain prohibited chlorate, arsenic compounds, mercury compounds, gallic acid, picric acid, magnesium powder, phosphorus, lead compounds, hexachlorobenzene or fireworks promoters and is an environment-friendly fireworks bursting charge; bursting performance of the fireworks bursting charge is better than that of traditional bursting charge under the same condition; the detection of the National Supervision and Inspection Center for Safety and Quality of Fireworks and Firecracker indicates that friction sensitivity of the composite aluminum powder is 0, impact sensitivity is 0, the ignition temperature is not lower than 410 DEG C, all safety indexes are better than those of the traditional bursting charge, and potential safety hazard is reduced fundamentally; the composite aluminum powder has excellent storage stability.