The utility model discloses an adjustable venturi applied to production of redispersible emulsion powder, which is characterized in that a hopper and a discharging pipe are of an integrated structure, and the discharging pipe is a straight pipe section. An inlet pipe section of the venturi is of a casing pipe structure, in the casing pipe structure, an axial position of an inner casing pipe in an outer casing pipe is adjustable, an inlet of the inner casing pipe serves as a contract opening, and a nozzle of the inner casing pipe forms a flaring in the outer casing pipe. The adjustable venturi is applied to a production process of the redispersible emulsion powder, can effectively improve adding speed of an anti-caking agent, and improves production capacity.