The utility model relates to an adjustable jet pump. The adjustable jet pump comprises an upper joint, a jet pump body, a lower joint, a power liquid attachment joint, a low pressure liquid attachment joint, and a bridge-type passageway, wherein the upper joint is connected with the outlet section of the jet pump body, and the power liquid attachment joint and the low pressure liquid attachment joint are connected with the power liquid passageway and low pressure liquid passageway of the lower joint; the bridge-type passageway is in movable connection between the jet pump body and the lower joint, and two more than high pressure passageways and one low pressure passageway are formed at each high pressure passageway at the outlet end of the bridge-type passageway; a valve rod is further arranged in the lower joint, one end of the valve rod is connected with the power liquid passageway of the lower joint, and the other end of the valve rod comes into contact with the end of the bridge-type passageway. The adjustable jet pump can meet the demand of the nozzle size under different conditions, thereby simplifying the working processes to some extent and improving the working efficiency.