The invention provides a remote variable-frequency constant-pressure pump set for construction and a control method thereof, the remote variable-frequency constant-pressure pump set for construction comprises a water storage tank, a water outlet main pipe, variable-frequency water pumps, electrically-operated valves, surge tanks, and a flying dust monitoring device; the water storage tank is provided with a water outlet, the water outlet main pipe is communicated with the water outlet, the variable-frequency water pumps are communicated with the water outlet main pipe through pipelines, the electrically-operated valve is communicated with the output end of the first variable-frequency water pump through a first water pipe, the water inlet end of the surge tank is communicated with a firstwater pipe through a second water pipe, and the flying dust monitoring device is electrically connected to the electrically-operated valves. By utilizing the remote variable-frequency constant-pressure pump set for construction in the invention, when the flying dust concentration of a construction site is higher than or equal to a preset concentration, the electrically operated valves are opened,so that the first water pipes connected to the variable-frequency water pumps are opened, and thereby the variable-frequency water pumps carry out dust suppression spray operation, the structure is simple, and the remote variable-frequency constant-pressure pump set for construction is convenient to operate.