Biological carbon base fertilizer combined operation machine based on corn straw returning to field

The invention discloses a biological carbon base fertilizer combined machine based on corn straw returning, which comprises a combined machine main body, the combined machine main body comprises a main body plate, a front returning mechanism, a rear turning mechanism and a fertilizing mechanism, the front returning mechanism is arranged at the front end of the main body plate, the rear turning mechanism is arranged at the rear end of the main body plate, and the fertilizing mechanism is arranged on the main body plate. The fertilizing mechanism is mounted above the main body plate and penetrates through the main body plate downwards; when an operator uses the combined operation machine main body, a biological carbon base fertilizer is added into the fertilizing mechanism, the combined operation machine main body moves forwards, the front field returning mechanism can crush and return corn to the field, the fertilizing mechanism applies the biological carbon base fertilizer into crushed corn straws, and then t