The invention relates to a guide device for correcting pectus excavatum. The guide device for correcting pectus excavatum comprises a guide machine and an ultrasonic probe arranged on the guide machine, wherein the guide machine is provided with a handle and a long-sheet-shaped guide sheet; the guide sheet is arranged and fixed on the handle and extends towards an outer arc curve; a perforation is formed in the tail end part of the guide sheet; and the ultrasonic probe is arranged and fixed on the tail end part of the guide sheet and transmits and receives an ultrasonic signal towards the tail end part extending direction of the guide sheet. According to the structural design that the ultrasonic probe is arranged and fixed at the front end of the guide machine, the guide device can greatly reduce the possibility of damage to blood vessels or heart caused by the guide machine and can relatively reduce surgical risk when the guide device is applied to the pectus excavatum correction surgery.