The invention discloses a sit-up training device and relates to the field of sport equipment. The sit-up training device comprises a sit-up plate and a bracket; a first supporting leg is arranged below the sit-up plate; a second supporting leg is arranged below the bracket; the sit-up plate comprises a bottom plate and a cover plate; a cavity is formed between the bottom plate and the cover plate; a supporting plate is arranged in the cavity; a double-shaft motor and a power supply are arranged on the supporting plate; the sit-up plate and the supporting plate are connected through an extending rod and an inserting hole; a leg blocking rack and a leg hooking rack are arranged on the bracket; the leg blocking rack and the leg hooking rack can be adjusted. The sit-up training device has the beneficial effects that the sit-up training device is simple to operate and flexible to adjust and has various use methods, and the use requirements of different people on the sit-up training device can be met.