The invention relates to a bored pile pore-forming quality detecting device. A fluid density signal input interface, an ultrasonic communication interface and a three-dimensional posture interface of a pore-forming detecting host of the bored pile pore-forming quality detecting device are sequentially connected with a fluid density sensor, an ultrasonic launching and receiving sensor and a three-dimensional posture sensor through cable transfer nodes of a take-up and pay-off spool and a cable bus. The cable bus is wound around the take-up and pay-off spool and controlled to be taken up and paid off by the take-up and pay-off spool, the cable bus is taken up and paid off on a depth counting pulley, the depth counting pulley records the take-up and pay-off length of the cable bus, and the depth feedback signal output end of the depth counting pulley is connected with the pore-forming detecting host. A GPS sensor is located over a probe, and the signal output end of the GPS sensor is connected with the GPS signal input end of the pore-forming detecting host. The bored pile pore-forming quality detecting device can detect parameters such as pore diameters, pore depths, perpendicularities, whole-pore mud densities, dreg thicknesses, boring inclination directions and pore opening coordinates of bored pile formed pores, and the bored pile pore-forming quality reliability is ensured.