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The pine pyrolysis semi-coke was used as the carrier, and the La-loaded semi-coke based catalyst was prepared by the impregnation method. The self-constructed two-stage pyrolysis furnace was used as the test platform to conduct the pine fuel rod catalytic pyrolysis test. The changes of three-phase products of biomass pyrolysis gas, tar, and coke with La-loaded semi-coke based catalysts at different reforming temperatures were studied. Through the change of gas composition, the change of FTIR spectrum of tar, and the characterization of SEM and XRD of the catalyst, the variation of temperature of La-loaded semi-coke based catalyst on the pyrolysis and reforming effect of biomass with temperature was discussed, and compared with the catalytic performance of catalyst-free and semi-coke as catalyst. The results showed that semi-coke based catalysts with a supported La content of 6% had better performance. When the catalytic reforming temperature was 800℃, the maximum yield of pine pyrolysis gas was 531g/kg, and the lowest tar production was 90g/kg after catalytic reforming with La-loaded semi-coke based catalyst. The H2 volume fraction was increased from 20.42% at 650℃ to 32.66% at 850℃. Compared with the conditions without catalyst and semi-coke catalyst, its H2 volume fraction at 800℃ was significantly higher than 16.77% without catalyst and 20.06% with semi-coke as catalyst. The amount of tar production was significantly reduced. After catalytic reforming, agglomeration of metal elements existed in the catalyst, and the active components La2O2CO3 and La were converted to La2O3. With the carbon and ash deposits blocking some pores on the catalyst surface, the catalytic activity was weakened. The results showed that La-loaded semi-coke based catalyst had good catalytic performance for pine pyrolysis.