Self-priming handheld high-pressure cleaning machine, characterized in that it comprises: a control component comprising a switch trigger, a motor component and a housing, the housing enclosing the motor component, and wherein the switch trigger controls the start and stop of the motor component; a pressure increasing pump comprising a pump body, a liquid inlet chamber, a liquid outlet chamber, a pressure increasing chamber and a piston; wherein the booster pump is disposed on the outside of the output end of the motor component of the control component, and wherein the pump body of the booster pump is installed at an exposed position of a corresponding end of the control component, and wherein the liquid is connected to the entrance of the liquid inlet chamber by a liquid inlet connection structure, and wherein the output end of the motor component is connected to the drive position of the piston; a liquid inlet port connected to the liquid inlet end of the liquid inlet connection structure; a liquid discharge port connected to the exit end of the liquid discharge chamber through a liquid discharge connection structure.
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