The invention discloses a polyester waste silk recycling and purifying device and relates to the related technical field of polyester waste silk recovery. The device comprises a cutting-off bin and awashing bin, a feeding hopper is fixedly connected to the top end of the cutting-off bin, a discharging pipe is fixedly connected to the bottom end of the cutting-off bin, a cutting-off shaft is arranged in the middle of the cutting-off bin, one end of the cutting-off shaft is movably connected with the cutting-off bin, the other end of the cutting-off shaft penetrates through the cutting-off binand is fixedly connected with a first servo motor, and the cutting-off shaft is circumferentially and fixedly connected with a cutting-off knife. The invention further discloses a polyester waste silkrecycling and purifying process. The process comprises the following steps of A, cutting, B, washing, C, water circulation, D, stirring, E, dehydration, F, aggregation and G, inspection. The dampingmechanism is arranged at the bottom of the cutting-off bin, the buffering effect is achieved, the vibration problem of the cutting-off bin is solved, the efficient washing effect is achieved through the arrangement of the fixing shaft, the machining efficiency is improved, the equipment requirement is low, and the machining cost is low.