Background: The study explores phyto-bioactive compounds in Solid Lipid Nanoparticles (SLN) and their potential use in cancer therapy. Objective: Most phyto-bioactive compounds have properties such as anti-inflammatory agents, antioxidants, anti-microbe agents, anti-arthritic agents, hypoglycemic agents, cardioprotective agents, and anti-cancer agents. Phyto-bioactive compounds are abundant in fruits, vegetables, and whole grains, and may impact metabolic processes improve health, and prevent illness. Breast, colon, and prostate cancers, as well as other malignancies, are now being studied for their potential prevention and treatment using therapies based on phyto-bioactive compounds in in vitro, in vivo, and clinical studies. Methods: More than 10 million individuals have lost their lives to cancer this year alone. Cancer is one of the most malignant and deadly diseases afflicting mankind today, and its death toll continues to rise. SLNs have been extensively used by several research groups to efficiently transport phyto-bioactive substances with enhanced anticancer effects. Now is the time for really groundbreaking ideas and innovations in the field of medicinal nanocarriers. Conclusion: Lipid nanoparticles’ size-dependent properties might lead to new therapeutics. Small size, large surface area, high drug loading, control pattern release, targeted drug release, and interface phase interaction are their benefits. Nanoformulations are undeniably powerful resources for therapeutic delivery applications; the current difficulty is in ensuring their safety, efficacy, and scalability for industrial production and eventual clinical use. Our review offers a novel perspective by focusing on the phyto-bioactive chemicals carried by these SLN nano-carriers, describing recent advancements and their potential applications to cancer therapy.