This article addresses the impact of radiation and Joule heating on MHD viscoelastic nanofluid flow over a stretching sheet in the presence of heat source. The novelty of the present investigation is to build up a model for nanomaterial involving Brownian motion and thermophoresis with convective boundary conditions. Using Similarity factors the governing equations which speak to the momentum, energy and diffusion are changed into ordinary differential equations. The transformed equations are solved numerically by the 4th order R. KFehlberg scheme by using shooting method. The influence of different parameters such as Brownian diffusion parameter Nb, thermophoresis parameter Nt, Eckert Number Ec, Lewis Number Le, viscoelastic parameter K, ratio parameter γ, magnetic field M, heat source parameter λ, radiation parameter Rd and temperature ratio parameter θw on f’ η), θ(η) and ø(η) profiles are portrayed and examined. Also, the numerical estimations of Skin friction, Nusselt and Sherwood numbers are discussed graphically. It is noticed that the rate of heat transfer of viscoelastic fluid increases with increasing values of temperature ratio parameter θw. The present outcomes are compared with the previously publishing results in the literature and found to be an excellent agreement was established. © 2019 by American Scientific Publishers All rights reserved.