The invention belongs to hydraulic experiment model facilities, and particularly relates to an experiment device for stable multi-angle entering-into-water of an object. The experiment device comprises a transparent water tank, an electromagnetic releasing device and a data acquisition system. The electromagnetic releasing device comprises supporting columns and a vertical rod. One end of the vertical rod is hinged with a transverse supporting rod through a first hinge joint, and the other end is hinged with an electromagnet block through a second hinge joint, wherein a water entering object is attracted with the bottom of the electromagnet block. A transverse water entering angle adjusting pointer and a longitudinal water entering angle adjusting pointer are vertically fixed on different sides of the vertical rod. A transverse water entering angle protractor is fixedly arranged on the transverse supporting rod. A longitudinal water entering angle protractor is fixedly arranged on the electromagnet block. The electromagnetic releasing device is connected with an industrial control computer through a cable. The data acquisition system comprises a synchronization instrument, a laser transmitter, a high-speed image photographing instrument and a high-speed camera, wherein the synchronization instrument is controlled by the industrial control computer. The experiment device can stably release water entering objects with different shapes and furthermore can accurately control the water entering angles of the objects.