PURPOSE: To provide a device for continuously kneading molding sand which can discharge by satisfying the necessary kneading degrees to the whole sands of the sand at the initial stage, the sand at the middle stage and the sand at the finishing stage of the kneading.

CONSTITUTION: A cylinder 16 for opening/closing the cover 10 of a discharging hole 3 is connected with fluid circuits attaching a pressure reducer 23, and a solenoid change-over valve 22 in the fluid circuits is electrically connected with a control panel 24 transmitting a signal by detecting the load power value of a driving motor 7 to constitute the molding sand continuous kneading device.