The invention provides a flow resistance adjusting device of a low-thrust liquid attitude control engine set. The flow resistance adjusting device of the low-thrust liquid attitude control engine set comprises a thrust chamber shell channel, a Z-shaped annular throttling orifice and an electromagnetic valve. The thrust chamber shell channel is provided with a propellant inlet hole and a propellant outlet hole and also provided with a thrust chamber front-of-valve annular liquid collecting cavity used for mounting the Z-shaped annular throttling orifice. The front-of-valve annular liquid collecting cavity is located in front of an inlet of the electromagnetic valve. A behind-valve throttling orifice can be selectively mounted behind the electromagnetic valve. The flow resistance adjusting device of the low-thrust liquid attitude control engine set has the deep throttling capacity, and has the characteristics of being good in rectification effect, compact in structure, capable of inhibiting water attack and good in technology capability.