The invention discloses a combined handheld obstacle-encountering alarm mobile phone holder. The main structure comprises a mobile phone holder support plate, a mobile phone holder handheld part, an alarm assembly, a handheld holder lower clamp position, a handheld holder upper clamp position, a handheld holder right clamp position, a handheld holder left clamp position, an ultrasonic emitter, an ultrasonic receiver, a mobile phone holder left infrared diode, a mobile phone holder right infrared diode, a mobile phone holder left photosensitive diode, and a mobile phone holder right photosensitive diode. The mobile phone holder support plate and the mobile phone holder handheld part with a hollow structure inside are connected by screws or cemented. The hollow structure in the mobile phone holder handheld part M is equipped with the alarm assembly. A single-chip microcomputer and a mobile phone are connected with each other in a WIFI, Bluetooth or USB way through a WIFI connection module, a Bluetooth connection module or a USB interface. When there is an obstacle in the alarm range, alarm information is sent out in the form of image or/and sound through a mobile phone screen or a mobile phone speaker to remind users to pay attention to the surrounding environment and avoid accidents.