The invention relates to the technical field of building materials and discloses full-automatic detection equipment and detection method for the water permeation rate of a water permeable brick. The full-automatic detection equipment comprises a program control system, a metering pump, a spraying system, a leveling system, a waterproof cover and a liquid level acquisition system. A water permeable brick sample is horizontally placed on a stainless steel plate sample stage with a rubber gasket. A rubber ring is arranged at the lower part of the square waterproof cover, a communicating pipe is arranged on the side surface of the square waterproof cover, and a hydraulic press, an ultrasonic material level meter and a drip irrigation tube are arranged right above the square waterproof cover. The positions of the hydraulic press, the ultrasonic material level meter, the drip irrigation tube and the stainless steel plate sample stage with the rubber gasket can be adjusted according to the sample size. Leveling nuts are arranged at the bottoms of four columns of a water tank. A level-meter, an overflow pipe and a water inlet with an electromagnetic valve are arranged on the water tank, high-low liquid level indicators are arranged on the side surface of the water tank, and an electrically operated valve and a drainage pipe are arranged on the oblique bottom surface of the water tank; a filter and an electronic flowmeter are arranged on the metering pump; the electronic components are connected with a PLC control cabinet; the PLC control cabinet is connected with a computer, so that automatic detection of the water permeation rate of the water permeable brick is realized, the detection accuracy is high and the operation is convenient.