The invention provides a linear polarization quasi-continuous fiber laser and relates to the technical field of laser. In order to solve the problems in the prior art, the laser comprises an electric control driving module, a linear polarization laser module and a laser amplification module, and the electric control driving module comprises a direct current power supply DC, a resistor R1, a resistor R2, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, an MOS tube MOS1, an MOS tube MOS2, a feedback amplifier U1 and a feedback amplifier U2. The linear polarization laser module comprises an indicator light device, N pump lasers, a first polarization-maintaining beam combiner, a polarization-maintaining high-reflection grating, a first polarization-maintaining gain optical fiber, a polarization device, a polarization-maintaining low-reflection grating and a first stripper, and the amplification module comprises M pump lasers, a second polarization-maintaining beam combiner, a second polarization-maintaining gain optical fiber and a second stripper.