The invention provides a simulated raining device for wet testing, comprising: a support platform; a support is arranged on the support platform; one end of a carriage in the longitudinal direction ishinged with the support, and the carriage can swing in a vertical plane; a frame body swinging receiving mechanism is connected with the carriage and supports the carriage; a water delivery device isarranged on the support platform and is provided with a valve; a water delivery main pipe is connected with the water delivery device, and the water delivery main pipe passes through the support andis placed on the carriage; a plurality of jet pipes are included, the inlet of each jet pipe is connected with the water delivery main pipe, and the outlet of each jet pipe is hinged with a nozzle; and the plurality of jet pipes are orderly arranged in parallel in the width direction of the carriage, and the lengths of the multiple jet pipes orderly arranged in parallel are gradually increased. The simulated raining device can accurately control and simulate the horizontal and vertical components of the natural rain and reduce the local abnormal raining rate. Through the adjustment of the height of the nozzle, the adjustment of the angle of the nozzle and the adjustment of the water amount, the effect of simulating the natural rain is real, and the adjustable range is wide.