The invention discloses an included angle measuring device for a drive axle. The measuring device comprises a main rod, a slide block and a measuring rod; the main rod is provided with a chute; the middle portion of the slide block is provided with a guiding hole, and the slide block is in sliding cooperation with the chute; the measuring rod comprises a connecting rod, a dial and pointer bench, and the dial is fixed in the end portion of the connecting rod; the pointer bench comprises a pointer and a bottom bench fixedly connected with the poiner, the pointer is in rotational cooperation with the dial, and the bottom side of the bottom bench cooperates with the drive axle; and the measuring rod is in sliding cooperation with the guiding hole. When the device is used for measurement, the main rod of the device is placed on a vehicle frame, the pointer bench is placed on the transmission shaft, and the scale of the dial is read to obtain the angle between the drive axle and the vehicle frame; operation is simple, and the measuring efficiency can be improved; and the device composed of the main rod, the slide block and the measuring rod is simple in structure and convenient to carry.