The invention discloses a moisture-absorbing antistatic dyeable composite type polypropylene fibre and a preparation method thereof. The fibre is a skin core--blending composite type polypropylene fibre manufactured in composite spinning technology by taking copolyether ester with the moisture-absorbing, dyeable and antistatic characteristics as a core layer and taking the mixture of polypropylene and the copolyether ester as a skin layer. The copolyether ester one of the copolymers formed from polyethylene terephthalate and poly alkylene ether glycol, the mass ratio of the skin layer to the core layer is 88:12 to 60:40, and the blending mass ratio of the polypropylene to the copolyether ester in the skin layer is 95:5 to 75:25. The fibre has good spinnability and white color in the machining process; and the fibres can be used for spinning long and short fibres and used as woven fabrics, knitted fabrics or nonwovens and endow the fabrics with good moisture absorption, antistatic behaviour, dryness and high color fastness.