The utility model relates to the field of penetration flaw detection equipment. The utility model relates to a washing device, in particular to a water-temperature-and-water-pressure-adjustable permeation detection washing device. Wherein the water tank, the water pump and the washing assembly are sequentially connected through pipes. A heating assembly is arranged below the water tank; the washing assembly comprises a first rod body provided with a control assembly and a second rod body detachably connected with the first rod body. A spray gun, a temperature sensor and a water pressure sensorare respectively arranged on the second rod body; the first rod body is further provided with a display panel, a first button capable of adjusting water temperature, a second button capable of adjusting water pressure and a switch button capable of controlling the spray gun to be started and stopped. The control assembly is electrically connected with the water temperature sensor, the water pressure sensor, the display panel, the water pump and the heating assembly. The water temperature and the water pressure of the spray gun can be adjusted according to actual requirements, the problem of insufficient cleaning or excessive cleaning caused by low or too low water pressure and water temperature is solved, and misjudgment or missed judgment is avoided.