The invention provides a test device of a machine oil collector, and belongs to the technical field of air tightness detection. The invention provides an automatic device used for conveniently detecting the air tightness of the machine oil collector. The test device of the machine oil collector comprises an inclined bench for fixing the machine oil collector. The inclined bench is provided with a groove corresponding to the bottom end surface of the machine oil collector in shape. The middle part of the groove is provided with a through hole communicated with an inner cavity of the machine oil collector. The through hole is communicated with an air charging device. A pressure detector is arranged at the through hole. A bulkhead corresponding to an upper end port of the machine oil collector is arranged. The bulkhead is connected to a piston of a bulkhead press-down cylinder. The bulkhead press-down cylinder is fixed on a traversing support. The traversing support is provided with a machine oil collector supporting plate. The test device of the machine oil collector has the advantages that the structure is simple, the operation is convenient, and by means of the automatic device, the detection efficiency is substantially improved.