Corrosion-release scale-proof wax-removal viscosity-reducing agent and preparation method thereof

A viscosity reducer with corrosion-inhibiting, scale-inhibiting and wax-cleaning functions consists of 2-alkyl-1-hydroxyethyl-3-hydroxypropyl-imidazoline sodium phosphate 5-10 wt%, lauryl dimethyl benzyl ammonium chloride 10-15 wt%, FC-NO1 fluorocarbon surface activator 0.05-0.2 wt%, alkylphenol ethoxylates(14) 3-8 wt%, methanal 3-7 wt%, hexamine 8-15 wt%, hexa-sodium metaphosphate 5-8 wt%, hydroxy-ethyl-crossing di-phosphoric acid 5-8 wt% and water residues. It has excellent coordination and corrosion protection and can be used in oil filed and oil well.