The invention discloses a water cooling machine base for a permanent magnetic explosion-proof motor. The machine base includes a first inner and outer sleeve provided with a water passage between inner and outer wall surfaces, wherein two ends of the inner and outer sleeve are respectively fixedly connected with an end board, the end boards are internally provided with end holes, inner circumferences of the end holes are provided with a first explosion-proof combination surface connected with a motor, two ends of a connection supporting portion are respectively fixedly connected with outer portions of the end boards at the two ends of the first inner and outer sleeve, and a circumferential side of the connection supporting portion is fixedly connected with the outer wall surface of the first inner and outer sleeve. The machine base is advantaged in that radial rigidity of the end boards is larger, deformation of the explosion-proof combination surface is smaller, the structure is simple, processing is easy, manufacturing cost is low, and the strength requirement and the flameproof performance requirement are met.