Amblymelanoplia microdentata is a species of beetle of the family Scarabaeidae. It is found in South Africa (Western Cape). The habitat consists of South Langeberg Sandstone Fynbos.
Adults reach a length of about . They are mostly dull black. The clypeus and the head have black setae. The pronotum has pale-brown and brown setae, some white scales at the posterior margin and black setae on the lateral and anterior margins. The elytra have pale-brown and black setae, and some white scales at the anterior margin.
The species name is derived from Latin micro (meaning very small) and dentat (meaning toothed) and refers to the row of very small teeth on the metathoracic pretarsomere.