The invention belongs to an electro-hydraulic servo valve, and particularly relates to a pre-stage split press-fit type jet pipe servo valve. The pre-stage split press-fit type jet pipe servo valve comprises a torque motor assembly, a receiver assembly and a power stage part; the torque motor assembly comprises an outer shell, an upper magnetic conductor, a lower magnetic conductor and an armature press-fit type assembly; the upper magnetic conductor and the lower magnetic conductor are fixed to the interior of the outer shell; the armature press-fit type assembly is positioned in the central axis of the upper magnetic conductor and the lower magnetic conductor, and the lower end of the armature press-fit type assembly penetrates through the bottom of the upper shell; the receiver assembly comprises a middle shell and a receiver which is positioned in the centre of the middle shell; and the power-stage part comprises a lower shell, a valve core which is positioned in a through cavity of the lower shell, two oil return throttling holes which are positioned at the lower end of the through cavity, and an oil filtering assembly which is fixed to the interior of a lower cavity. A torque motor air gap can be adjusted through an air gap adjusting gasket; the torque motor air gap consistency is good; the electro-hydraulic servo valve is not required to be disassembled and assembled during a debugging process; welding problems are avoided; and a threaded structure and power loss in the valve core are avoided.