The invention belongs to the technical field of a mathematics teaching aid and particularly relates to a probability theory experiment model teaching aid. The teaching aid comprises a casing, a support, a disposing groove, a buffer hole, an ejection groove and an ejection module, wherein the ejection module comprises a first limit unit, a second limit unit, a guide column, a fixing block and a spring, the first limit unit and the second limit unit have the same structures and are symmetric to each other, the first limit unit comprises a pressing column, a swing plate and a rope, one end of thepressing column is hinged with one end of the swing plate, the pressing column moves to push the swing plate to rotate around a rotation shaft, one side of an upper end of the swing plate is providedwith two half-circle projections, one side of a lower end of the swing plate is fixedly connected with the rope, the rope is fixedly connected with a lower end of the guide column after passing through a guide roller, an upper end of the guide column is fixedly connected with a bottom portion of the spring, and the spring is arranged between the two swing plates. The probability theory experimentmodel teaching aid is advantaged in that through setting the ejection module, a batch of coins are ejected, continuous ejection of the coins can be achieved, and experiment efficiency is improved.