The invention provides an ore crushing machine suitable for different sizes. The machine comprises an ore crushing machine body, a material conveying conveyor belt, a feeding conveyor belt, a baffle plate, an initial treatment device, a feeding hopper, a crushing box, a material discharging opening, a gearbox, a motor box, a control box, a power control panel, a second motor, a rubber base, a belt, a third motor, supporting legs, conveyor belt rolling roller, a combustion box, a water tank, a water pump, a gas tank, a gas delivery pipe, a first pressing plate, a crushing table, a first hydraulic cylinder, an electric drill, a second hydraulic cylinder, a second pressing plate, a top plate, a fire spraying head, a water spraying head, a connecting rod and a drill bit. According to the ore crushing machine, large ores can be rapidly crushed into small ores by an fire-burning water-cooled electric drill, and then the small ores are conveyed to a crusher through a conveying belt for crushing, so that blockage is prevented, the crushing efficiency is improved, the crusher is protected and prevented from being damaged by the large ores, the service life of the crusher is prolonged, the crushing time is rapid, the quality is good, convenience is brought to people, the structure is simple, and the popularization is convenient.