The invention discloses an expansion joint used for a fire-fighting hose, relates to an improvement of a fire-fighting tool device, and in particular to an improvement of the expansion joint for the fire-fighting hose. The fire-fighting hose expansion joint comprises an upper connecting head and a lower connecting head, the upper part of the upper connecting head is fixedly connected to the fire-fighting hose, the lower part of the lower connecting head is fixedly connected to the fire-fighting hose, an outer thread is arranged on the lower part of the upper connecting head, an inner thread is arranged on the upper part of the lower connecting head, and the outer thread is connected with the inner thread in a sleeved mode. According to the fire-fighting hose expansion joint, the lower part of each upper clamping head is of an inward circular table structure, the upper part of each lower clamping head is of an external tensile structure, when the upper connecting head and the lower connecting head are connected, the lower end of the upper clamping heads abuts against the inner side of the top of the lower clamping heads, and the connection between the upper connecting head and the lower connecting head are tightened. According to the fire-fighting hose expansion joint, any other spare parts are not needed, quick connection and fast sealing can be realized without adding any components during application, and time and speed of field rescue are ensured.