The invention provides a dry-type filter dust collector performance parameter high-precision measuring device and measuring method. A dust collector device is formed by a gas-collecting hood, a flow collector, a dust collector, a draw-out type blower fan and air inlet and outlet pipelines, which are connected in sequence. A measuring mechanism comprises pitot tubes, dust collection tubes, a micromanometer, a processor, a dust feeder and a dust diffusion tube. The pitot tubes N1, N2 and the dust collection tubes Z1, Z1 are arranged in the air inlet pipeline; an electric control flowmeter L1 isconnected with electric control flow valves K1, K3; an electric control flowmeter L2 is connected with electric control flow valves K2, K3; the processor is connected with the micromanometer and the electric control flowmeters L1 and L2; the dust feeder is connected with the entrance end of the dust diffusion tube through a pipeline; and the dust diffusion tube is arranged at the left opening endof the gas-collecting hood. The method is characterized by calculating air leakage rate; measuring performance parameters of the dust collector in the filtering process; and measuring performance parameters of the dust collector in the dust removing process. The device and method reduce personal errors during measurement, and can conveniently and accurately collect and process experiment data.