The invention relates to a full-automatic mouldy bean curd fermentation machine and belongs to the technical field of mouldy bean curd fermentation machines. The full-automatic mouldy bean curd fermentation machine comprises a fermentation container body and a main control chip. A heating device is arranged on the lower portion of the fermentation container body and used for heating the fermentation container body. A light dependent resistor sensor and a light emitter are arranged at the equal-height positions of the side walls of the fermentation container body, wherein the light emitter is used for emitting horizontal light beams, and the light dependent resistor sensor is used for receiving the light beams and measuring the intensity of the light beams. Horizontal sliding rails are arranged under the light dependent resistor sensor and the light emitter respectively, and a horizontal knife is erected on the sliding rails and can slide along the sliding rails in sequence to be used for cutting bean curd to be equal in height. The full-automatic mouldy bean curd fermentation machine has the advantages that the structure is simple, cost is low, the automation degree is high, produced mouldy bean curd has the advantages of being good in standardization, high in quality and the like, and the full-automatic mouldy bean curd fermentation machine can be used for standardized and industrialized production of the mouldy bean curd.