The invention discloses a release control system of dry powder fire-extinguishing equipment. The release control system comprises a system starting module, a release starting module and a release control module, which are connected in parallel; the system starting module is provided with a first relay and a system starting receiver solenoid valve, which are connected in parallel; a branch circuit where the system starting receiver solenoid valve is arranged is connected with a normally open switch of the first relay in series; the release starting module comprises an electric contact pressure unit, a dry powder release solenoid valve and a second relay; the dry powder release solenoid valve is connected with the second relay in parallel; the electric contact pressure unit is connected with a normally open contact of the second relay in parallel and two parallel branch circuits are connected in series; the release control module is provided with a pressure switch, a normally open solenoid valve and a normally closed solenoid valve; and the normally open solenoid valve and the normally closed solenoid valve are connected in parallel and then are connected with the pressure switch in series. The release control system of the dry powder fire-extinguishing equipment realizes accurate control and keeps pressure released by a dry powder storage tank constant; and dry powder is sprayed evenly and the fire-extinguishing effect is improved.