The present invention provides a coin recognition device comprising an integrated circuit, a coin receiving member, and a retractable trigger mechanism. The integrated circuit comprises a built-in recognition program and a plurality of pads as signal input ends thereof. The recognition program is configured for discriminating denomination of coins based on signals from the pads. The coin receiving member defines a coin slot for coins to be inserted. The retractable trigger mechanism is associated with the coin slot and is disposed on the coin receiving member. The trigger mechanism comprises a conductive contact part attached thereto. The contact part moves together with movement of the trigger mechanism in response to the insertion of coins. When the contact part moves to corresponding positions in relation to varying diameters of coins, the contact part at each specific position is electrically connected to one respective pad to stimulate a signal.