The invention discloses a remote optical pumped amplifier for distributed optical fiber sensing. The amplifier comprises a pulse signal light source, a pulsed pump light source, a first wavelength division multiplexer, a front-end sensing optical fiber, a rear-end sensing optical fiber and a passive part, wherein the passive part comprises a first coupler, a first optical isolator, a first erbium-doped optical fiber, a first optical filter, a second erbium-doped optical fiber, a second optical fiber and a first optical loop device; the pulse signal light source and the pulsed pump light source are connected with two ports of the first wavelength division multiplexer respectively; the other port of the first wavelength division multiplexer is connected with the front-end sensing optical fiber; the two ends of the passive part are connected with the front-end sensing optical fiber and the rear-end sensing optical fiber respectively. The amplifier has the advantages that the amplifier structurally comprises the pulsed pump light source and the erbium-doped optical fibers, so that forward optical signals can be amplified, and backward scattered light can also be amplified; the amplifier structurally comprises the filters, so that unnecessary wavelengths can be filtered, light noise is reduced, and the optical fiber detection distance is effectively prolonged.