Prostate cancer associated lncRNA transcript 1 (PCAT-1) has been identified as an oncogenic long non-coding RNA (lncRNA) in some solid tumors, including prostate cancer (PC). However, the molecular mechanism of PCAT-1 involved in PC is poorly defined. In this study, we found that PCAT-1 expression was up-regulated and miR-145-5p expression was down-regulated in PC tissues and cells. Function analysis indicated that PCAT-1 overexpression promoted proliferation, migration, invasion and inhibited apoptosis of PC cells. Rescue experiments demonstrated that miR-145-5p restoration attenuated the promotive effects of PCAT1 on PC progression, while Fascin-1 (FSCN1) upregulation relieved the anti-cancer role of miR-145-5p in PC. Mechanical analysis discovered that PCAT-1 could act as a miR-145-5p sponge to modulate FSCN1 expression. In conclusion, these findings suggested that PCAT-1 accelerated PC cell proliferation, migration, invasion and suppressed apoptosis by up-regulating FSCN1 mediated via miR-145-5p, hinting a potential therapeutic strategy for PC patients.