The invention discloses a power amplifier circuit, a power amplifier and a laser television. The power amplifier circuit comprises: a power amplifier circuit, a power supply circuit and a power amplifier driving circuit; the power supply circuit is electrically connected with the power amplifier driving circuit; The power supply circuit comprises an LLC resonance circuit and an over-current protection circuit. The over-current protection circuit is connected in parallel with the LLC resonant circuit. The over-current protection circuit comprises a first resistor and a second resistor. The first end of the first resistor is electrically connected with the output end of the LLC resonant circuit. The second end of the first resistor is electrically connected with the over-current protection end of the LLC resonant circuit, the first end of the second resistor is electrically connected with the output end of the LLC resonant circuit, the second end of the second resistor is grounded, and the second resistor is a variable resistor. According to the invention, the problem of downtime or burn-out of a post-stage circuit board caused by playing low-frequency music and videos can be effectively solved.