The invention provides a while-drilling remote control type multi-stage bent-angle-adjustable screw drilling tool, which comprises a casing, a stator, a rotor, a shaft coupler, a bearing and an output shaft, wherein a steering knuckle is connected between the shaft coupler and the output shaft; a bypass hole is processed in the output shaft; an adjusting device is arranged in an annular space formed between the casing and the output shaft, and is glidingly matched with a positioning pin; a spring is arranged outside the output shaft arranged at the lower part of the adjusting device; and an eccentric matching structure is formed among the adjusting device, the output shaft and the casing. The screw drilling tool has the advantages that the bent angle of the underground screw drilling tool is controlled through turning on/off of the pump on the ground; the multi-stage adjustment can be performed, so that the technical requirements of drilling processes of wells with different build angle rates and complicated structures can be met; meanwhile, the number of drilling tool replacing times of pipe tripping is reduced; the underground complicated condition occurring risk is reduced; and the drilling efficiency of wells with complicated structures is improved.