The super regeneration receiver model is upgraded to 433 MHz in ISM band to solve the problem that the traditional dynamic model of super regeneration oscillator works at a low frequency and has no practical reference value. The chaotic dynamic characteristics of the improved model are studied by using the numerical simulation method of the software. The Lyapunov exponent method is used to quantitatively detect the chaotic state of the model, and the detection ability of receivers in different states at this frequency is studied. The simulation results show that the 433 MHz super regeneration receiver can produce chaos when controlled by a low frequency quench signal. The sensitivity of the chaotic super regeneration receiver in this frequency band is about 3 dB higher than that in the periodic state. This proves that chaos can be generated and applied to the super regeneration receiver in the actual ISM band. This provides a feasible scheme to improve the weak signal detection capability of the super regeneration receiver.