The present invention discloses a magnesium and magnesium alloy surface cladding preparation method which comprises the following procedures: a) the surface is cleaned up; b) electrolyte for micro-arc oxidation is a water-based solution, wherein, the concentration of sodium fluoride is between 1 g/L and 40 g/L; the concentration of sodium phosphate is between 1 g/L and 100 g/L; the sodium fluoride and the sodium phosphate can be used separately or in a combined way, or sodium hydroxide with the concentration between 0.05 g / L and 10 g / L is further added to use; c) the surface is treated bychemical plating and/or d) electroplating; water cleaning is only required among the procedures. The invention based on the knowledge of the related mechanism of plating technology and micro-arc oxidation technology makes the best of the advantages in particular that the micro-arc oxidation ceramic film has the characteristics of corrosion resistance and porosity, and combines the surface ceramictechnology and the surface alloy technology organically and solves the problems of complex working procedures, high cost, large pollution, imperfect effect, etc., in the prior plating art. With the method provided by the invention, a cladding with uniformity, smoothness, a compact structure and excellent performance can be achieved.