This paper proposed parking robot based on fuzzy reasoning and parking big data. The parking difficulty membership degree was computed on the basis of the time spent for looking for parking space at parking lot. The free membership degree at the current time corresponding to the parking difficulty membership degree of the parking lot can be reasoned out based on the parking difficulty membership degree and the free membership degree of the parking lot at each preset time point. The parking robot will reduce the cost needed to predict the free membership degree of the parking lot.