The invention discloses an unbonded prefabricated beam column L-shaped joint, and belongs to the technical field of structural construction. The structure comprises a prefabricated concrete lower column, a prefabricated concrete upper column, a prefabricated concrete beam plate, a prestressed steel strand, a foundation structure and an anchorage device; and the structure is formed in the mode thatthe prefabricated concrete lower column, the prefabricated concrete beam plate and the prefabricated concrete upper column are hoisted together in sequence from bottom to top, the prestressed steel strand is pre-buried in the foundation structure and penetrates through a structure system through hole channels of the columns, beam plates can be continuously arranged on the upper column, and tensioning is conducted every five layers and conducted on the top end of the uppermost column. According to the unbonded prefabricated beam column L-shaped joint, the connecting characteristics of wood structure mortises and tenons are used for reference, and therefore the higher the pressure is, the more compact the structure is; and in addition, prefabrication is really achieved, the construction period is greatly shortened, the bearing capacity is high, the overall performance is good, and the unbonded prefabricated beam column L-shaped joint can be reused, is green and environmentally friendlyand has the quite high economic benefit.