Platelet-rich plasma (PRP) has seen wide clinical use owing to its regenerative and repair abilities. To investigate anti-photoaging effects of pre- and post-treatment of PRP on UVB-damaged HaCaT cells. HaCaT cells were irradiated with 80 mJ/cm2 UVB, before or after PRP treatment (1000×107 /L) and following measurements were taken: Survival rate of UVB-irradiated HaCaT cells, malondialdehyde (MDA) content, and activities of glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), catalase (CAT). Western blot was used to determine the effect of different PRP intervention on the expression of PI3K, AKT, ERK, MMP-1, MMP-9, TIMP-1 and γ-H2AX in the UVB-irradiated HaCaT cells. Pre- and Post-PRP treatment reduced MDA content and increased the activities of GSH-Px, SOD, and CAT in photoaged HaCaT cells. These changes resulted in reduced cytotoxic effects. Besides, different PRP intervention promoted cell proliferation via PI3K/AKT pathway. Furthermore, PRP application suppressed the expression of γ-H2AX. Also, PRP intervention alleviated photoaging effects by upregulating the expression level of tissue inhibitor of metalloproteinases-1(TIMP-1) while downregulating matrix metalloproteinase(MMP) expression level in photoaged HaCaT cells. Pre- and Post-PRP treatment play anti-photoaging role through strengthening cellular oxidative defense capacity, mitigating MMP expression, alleviating DNA damages and promoting proliferation of UVB-irradiated HaCaT cells. This article is protected by copyright. All rights reserved.