The invention discloses an ASK demodulation circuit without a low pass filter. The ASK demodulation circuit comprises a pulse shaping circuit, a voltage amplification circuit, a level selection circuit, and a self-sampler circuit, wherein the pulse shaping circuit is electrically connected with the voltage amplification circuit, the voltage amplification circuit is electrically connected with thelevel selection circuit, the level selection circuit is electrically connected with the self-sampler circuit, a VASK_IN node of the pulse shaping circuit is used as an input end of the whole circuit,after a signal passes the pulse shaping circuit, a VCK is formed and is used as a clock signal, the clock signal and a signal are synchronized in the self-sampler finally, the voltage amplification circuit inputs a VASK_IN signal into the voltage amplification circuit to perform effective voltage amplification to obtain an amplified VAMP signal, the level selection circuit performs level selectionon the VAMP signal so as to select effective information to form a VSM node to output, and the self-sampler circuit sends a VSM node output to the self-sampler to perform signal processing, so as tooutput a VOUT signal, then signal demodulation is completed.