The invention discloses an adjusting device of a scraper conveyor. The scraper conveyor is hinged to a hydraulic support through a hydraulic pushing and moving rod which is horizontally arranged, and a hydraulic oil cylinder is arranged between the scraper conveyor and the hydraulic support. An upper hinge base is arranged on the scraper conveyor, a lower hinge base is arranged on the hydraulic support, a circular hole in the telescopic end of the hydraulic oil cylinder is hinged to the upper hinge base through a pin roll, and a circular hole in the fixed end of the hydraulic oil cylinder is hinged to the lower hinge base through a pin shaft. When the bottom of the scraper conveyor needs to be lifted or put down, fluid is supplied to the hydraulic oil cylinder, the telescopic end of the hydraulic oil cylinder extends outwards or retracts inwards, the scraper conveyor is driven to rotate around the hinge point of the scraper conveyor and the hydraulic pushing and moving rod, and therefore the lifting or putting-down of the bottom of the scraper conveyor is achieved. The adjusting device of the scraper conveyor is small in occupied area, wide in adaptability range, simple to operate, flexible to use, and suitable for being used for lifting of the bottom of the scraper conveyor in a complex geological condition or a working face with pitching exploitation.