The utility model aims to disclose a portable water cutting machine for emergency rescue. The device comprises a portable air compressor, a water tank, a modified abrasive mixing water tank, an air-driven liquid booster pump and a handheld cutting head, compared with the prior art, a portable air compressor provides a compressed high-pressure air source as driving power; the two-position four-waypneumatic control reversing valve controls the gas-driven liquid booster pump to pressurize water supplied to the hydraulic cylinder by the water tank; then the pressurized high-pressure water flows into a modified abrasive mixing water tank containing abrasive particles, additives and water; pressurizing the mixed fluid to water pressure required by cutting; and finally, high-pressure high-speedabrasive water jet is sprayed out by the handheld cutting head, so that objects are cut, explosion sources such as electric sparks are not generated, and the handheld cutting device can be applied tocutting operation in a dangerous chemical environment, is small in overall size and mass, convenient to carry and transport, simple in structure and very practical, and achieves the purpose of the utility model.