The invention relates to a mixing device for producing fruit mousse and a using method, and belongs to the field of mixing equipment, the mixing device comprises a dissolving barrel, a feeding port is formed in the top end of the dissolving barrel, a crushing device is arranged at the position, close to the feeding port, of the dissolving barrel, a stirring and hammering device is arranged in the dissolving barrel, and a temperature control jacket is arranged outside the dissolving barrel; a first discharging pipe is arranged at the bottom end of the dissolving barrel in a penetrating mode, a first discharging valve is arranged on the first discharging pipe, the end, away from the dissolving barrel, of the first discharging pipe is fixedly connected and communicated with a mixing tank, a feeding port is formed in the top end of the mixing tank, and a discharging port is formed in the bottom end of the mixing tank. Fruit and gelatin are crushed through the crushing device and stirred and beaten through the stirring and hammering device, on one hand, the fineness of puree is improved, the taste of a finished product is improved, on the other hand, the gelatin is crushed into small pieces and can be quickly dissolved into fruit pulp, and effective mixing of the gelatin and the fruit pulp is achieved at a low temperature; and the mouth feel and the flavor of the mousse are improved.