The invention discloses a simple sea motion simulation platform device, which comprises a base, the base is provided with a vertical guide rod, a support frame is sleeved on the guide rod to be matched with the guide rod in a sliding way, a swinging rod is fixed on a first electrical machine arranged on the base, the swinging rod is matched with a guide way arranged on the support frame by a slide block, the support frame is provided with a second electrical machine, one end of a material carrying platform is articulated with the support frame, and the other end of the carrying platform is matched with a cam wheel of the second electrical machine. The first electrical machine, the swinging rod, the second electrical machine and the cam wheel form into a 'sine-cam wheel' mechanism. The sine-cam wheel realizes the motion on the direction of rising and sinking, realizes the motion on the transverse direction, mutually overlaps the two motions, can respectively control the rotation speedsof the two drive motors though an adjustable resistor, realizes the adjustability of the motion frequency on two directions, and can adjust the amplitude on the direction of rising and sinking by changing the operating distance of the swinging rod.