The invention relates to an explosion-proof dynamo van for a coal mine. The main structure consists of a tractor, a van seat, a front wheel, a rear wheel, a diesel engineer, an oil tank, a water replenishing water, an air filter, an air cooler, a gas supercharger, an exhaust gas processing tank, a gas storage tank, a radiator, a fan, a generator, a coupler, a soft starter, a liquid crystal display screen, a console panel, a pipeline, a circuit board and a conducting wire; the dynamo van adopts the large-power diesel engineer as power, carries out peripheral distribution and drives the generator to generate power; the revolution of the generator is 1,500 r/min; the generating voltage is between 660 and 1,140 V; the power is between 160 and 200 kw; after power generation, the voltage is adjusted and reduced by the soft starter and is input to driven equipment; the driven equipment is started; the range of voltage regulation is 30 to 85 percent of the rated voltage; after voltage regulation and reduction, the impact moment of startup can be reduced; the starting capacity is increased; and after startup, normal voltage is restored. The dynamo van has reasonable design, a compact structure, strong generating capacity, high voltage, large powder, safety, stability and reliability, and can be used for various large and middle-sized equipment of the underground of the coal mine.