The objective of the invention is to provide an extendable concrete chute device which can allow concrete chutes to adapt to various occasions by adjusting the length of the chutes. The extendable concrete chute device includes a main chute mechanism, a control system, and a length adjustment extendable mechanism, a supporting system and a base system which are electrically connected to the control system. The beneficial effects of the invention are that the length adjustment extendable mechanism arranged in the main chute mechanism can adjust the length of the chute according to the concretetransfer demand, and can meet the use demands of various occasions.