Rapid combined type air tightness test water tank

The utility model discloses a rapid combined type air tightness test water tank, which comprises a plurality of splicing modules which are detachably and hermetically connected end to end in sequence, the splicing module comprises a groove body, the groove body comprises a bottom plate and side plates arranged on the two sides of the bottom plate, openings are formed in the two ends of the groove body, and a cover body capable of being opened and closed is arranged at the top of the groove body; the end of the groove body of the splicing module located at the head end and the end of the groove body of the splicing module located at the tail end are each provided with an end sealing plate. The air tightness testing water tank is of a splicing structure, a proper number of splicing modules can be selected for splicing according to the length of a to-be-tested pipeline, the air tightness testing water tank with a proper length is spliced, and compared with an original mode that a water tank needs to be rebuilt,