Sulfamic acid series water reducing agent

The invention discloses a sulfamic acid series water reducing agent and belongs to the field of chemical engineering. The sulfamic acid series water reducing agent is composed of 20-40 parts of phenol, 25-50 parts of anhydrous p-Aminobenzene sulfonic acid, 8-15 parts of urea, 80-120 parts of formaldehyde, 0.08-0.12 part of concentrated sulfuric acid and 20-40 parts of sodium hydroxide. According to the sulfamic acid series water reducing agent, a synthesis reaction does not need an air entraining agent, production cost is greatly lowered, the degree of the reaction is large, and dispersibility of concrete is good.