Four new phenylpropanoid glycosides, 9-O-[${eta}$-D-glucopyranosyl-(1${ ightarrow}$2)-${alpha}$-L-rhamnopyranosyl]- 3,4-dimethoxy-cinnamic acid (1), 9-O-[${eta}$-D-glucopyranosyl-(1${ ightarrow}$2)-${alpha}$-L-rhamnopyranosyl]-4-methoxycinnamic acid (2), 9-O-${alpha}$-L-rhamnopyranosyl-3,4-dimethoxy-cinnamic acid (3), and 9-O-[6-O-acetyl-${eta}$-D-glucopyranosyl]-4-methoxy-cinnamic acid (4), together with three known compounds 9-O-${alpha}$-L-rhamnopyranosyl-4-hydroxy-cinnamic acid (5), 9-O-${eta}$-D-glucopyranosyl-4-methoxy-cinnamic acid (6), and 9-O-${eta}$-D-glucopyranosyl-3,4-dimethoxy-cinnamic acid (7) were isolated from the 70% EtOH extract of the dry fronds of Microlepia pilosissima. Their chemical structures were elucidated by spectroscopic analysis. Moreover, 1 and 2 exhibited comparable scavenging activities with $({pm})$-${alpha}$-tocopherol against DPPH radicals, while compounds 3-7 displayed moderate antioxidant activities.