The present invention relates to a multi-purpose tidal-flat aquarium that can be used for education, ornamental use, and experimentation as an aquarium capable of observing the life, excavation activities and habitat types of excavating animals such as lagoons and some crabs inhabiting the tidal flats or mudflats, An inner space in which a substrate suitable for living organisms and a habitat environment is stacked and breeding seawater is supplied to form habitats and excavation activities in the installed inner space, a water tank main body formed of a transparent material to allow the inner space to be viewed from the outside, A first water tank which is divided into a first water tank including the second water tank and a second water tank which is divided into a first water tank and a second water tank, A circulation unit connected to the water tank main body to supply and drain the breeding seawater in the form of tide and ebb, A shell portion provided outside the body for controlling light so as to correspond to the habitat environment of the tidal flat creatures inputted into the water tank body breeding seawater supplied to the water tank main body is supplied and drained in the form of tide water And a controller for controlling the water tank body to be circulated by detecting temperature maintenance. The water tank body is narrowly formed so that the life of the vertical excavator animal, the relationship between the water layer and the substrate, It is congenial and offers the advantage of being able to experiment with excavated organisms in schools and universities.본 발명은 갯벌 혹은 뻘조하대에 서식하는 갯지렁이나 일부 게류 등 굴착동물 등의 생활상과 굴착활동과 서식형태를 관찰할 수 있는 수족관으로 교육용, 관상용, 실험용으로 사용될 수 있는 다목적 갯벌 수족관에 관한 것으로, 갯벌생물과 서식환경에 적합한 기질이 적층되며 사육해수가 공급되어 상기 시설된 내부공간내의 서식상태 및 굴착활동을 이루게 하는 내부공간과, 상기 내부공간을 외부에서 투시되게 투명소재로 형성되는 수조본체, 상기 수조본체 내부공간 중 일부를 가로막아 상부는 각기 다른 생물들이 서식환경을 조성토록 하는 제2수조, 하부는 상기 제2수조를 포함하여 사육해수가 공급되는 제1수조로 구분 분할되게 형성하는 배수판, 상기 수조본체에 연결되어 사육해수를 밀물과 썰물형태로 공급 및 배수 순환하는 순환부
