The invention relates to the technical field of ventilators, in particular to a ventilator integral 
impeller and method for preparation. An 
impeller angle is not accurate, which is caused by the affect of many reasons which are 
machining error, blade installation angle measurement error, electric 
welding thermal deformation error and worker 
processing technical level and the like, thereby the intensity of a ventilator fan is reduced, the 
noise is increased, the work efficiency is low, the 
power consumption is large and the maintenance ratio is high. In order to overcome the above defects, the invention uses the technical scheme that the ventilator integral 
impeller comprises a blade, a hub, a 
spoke and a bearing sleeve, wherein the blade, the hub, the 
spoke and the bearing sleeve are a 
whole body which are connected together through 
casting in one time. The ventilator integral impeller is made through 
casting in one time, the problems which are common in 
processing of the impellers such as 
rosin joint and unclosed riveting and the like do not exist, the intensity is high, the security is excellent, the production cost is low, the 
energy consumption is saved, the environmental condition is improved, and the economic benefit is increased.