The present invention provides a transmission signal receiving method and device, comprising: continuously receiving the transmission signal, judging whether the first preset number of first square wave signals are received, if not, ending the reception, and if so, calculating the current signal transmission period ;Judge whether the second square wave signal is received, if not, end the reception, if it judges whether the second preset number of second square wave signals are received, if not, end the reception, if so, judge whether the third wave signal is received , if no, end receiving, if yes, judge whether the third preset number of third-party wave signals is received, if not, end receiving, if yes, if the second square wave signal starts at low level and ends at high level, it is judged as positive In the phase receiving state, decode the data after the third wave signal according to the first decoding rule; if the waveform of the second square wave signal starts at a high level and ends at a low level, it is judged as an inverse receiving state, and according to the second decoding rule The data following the third wave signal is decoded.