A multifunctional infrared signal processing method comprising: when it is determined by a mobile terminal that a current operation mode is a first operation mode, processing, by the mobile terminal, preset first data to form a first infrared signal, transmitting the first infrared signal, and recording transmitting time; when it is determined by the mobile terminal that a received second infrared signal is a reflective signal of the first infrared signal, recording receiving time; acquiring first measurement data according to the transmitting time and the receiving time; or, when it is determined by the mobile terminal that the current operation mode is a second operation mode and an attribute of an object to be measured is a first attribute, focusing target infrared radiation energy to form a third infrared signal; processing the third infrared signal, and acquiring second measurement data according to the first attribute and data obtained by processing the third infrared signal, wherein focusing target infrared radiation energy to form the third infrared signal comprising: aggregating target infrared radiation energy in a field of view, and focusing the target infrared radiation energy to a photoelectric detector to form the third infrared signal; or, when it is determined by the mobile terminal that the current operation mode is a third operation mode and a type of a device to be controlled is a first type, detecting an input control signal, and acquiring first control data according to the first type and the input control signal; and processing the first control data to form a fourth infrared signal, and transmitting the fourth infrared signal for controlling the device to be controlled, wherein processing the first control data to form the fourth infrared signal comprising: coding the first control data, performing pulse modulation on the coded first control data to form a second transmitting signal, performing amplification and infrared light emitting diode conversion on the second transmitting signal to form the fourth infrared signal. when it is determined by a mobile terminal that a current operation mode is a first operation mode, processing, by the mobile terminal, preset first data to form a first infrared signal, transmitting the first infrared signal, and recording transmitting time; when it is determined by the mobile terminal that a received second infrared signal is a reflective signal of the first infrared signal, recording receiving time; acquiring first measurement data according to the transmitting time and the receiving time; or, when it is determined by the mobile terminal that the current operation mode is a second operation mode and an attribute of an object to be measured is a first attribute, focusing target infrared radiation energy to form a third infrared signal; processing the third infrared signal, and acquiring second measurement data according to the first attribute and data obtained by processing the third infrared signal, wherein focusing target infrared radiation energy to form the third infrared signal comprising: aggregating target infrared radiation energy in a field of view, and focusing the target infrared radiation energy to a photoelectric detector to form the third infrared signal; or, when it is determined by the mobile terminal that the current operation mode is a third operation mode and a type of a device to be controlled is a first type, detecting an input control signal, and acquiring first control data according to the first type and the input control signal; and processing the first control data to form a fourth infrared signal, and transmitting the fourth infrared signal for controlling the device to be controlled, wherein processing the first control data to form the fourth infrared signal comprising: coding the first control data, performing pulse modulation on the coded first control data to form a second transmitting signal, performing amplification and infrared light emitting diode conversion on the second transmitting signal to form the fourth infrared signal.